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Differential / Manual Transmission Fluid Change
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Pelican Technical Article:

Differential / Manual Transmission Fluid Change


1 hr






16mm triple-square tool, 17mm hex socket (five-speed), 10mm hex socket (six-speed)

Applicable Models:

Porsche 986 Boxster (1997-04)
Porsche 986 Boxster S (2000-04)
Porsche 987 Boxster (2005-12)
Porsche 987 Boxster S (2005-12)
Porsche 987 Cayman (2007-12)
Porsche 987 Cayman S (2006-12)

Parts Required:

Transmission Fluid

Hot Tip:

Make sure that you have a 4 quart drip pan and plenty of paper towels

Performance Gain:

Longer life transmission

Complementary Modification:

Use Swepco 201 transmission fluid for better shifting
101 Performance Projects for Your Porsche Boxster

This article is one in a series that have been released in conjunction with Wayne's new book, 101 Performance Projects for Your Porsche Boxster. The book contains 312 pages of full color projects detailing everything from performance mods to changing your brake pads. With more than 950+ full-color glossy photos accompanying extensive step-by-step procedures, this book is required reading in any Boxster owner's collection. The book is currently available and in stock now. See The Official Book Website for more details.

One of the easiest tasks to perform on your manual transmission Boxster is to change the transmission oil. The Boxster transmission is what is known as a transaxle. It includes all the standard components of a normal transmission, plus an integrated differential. This design is possible because of the mid-engine design of the Boxster. The transaxle design is more compact and theoretically lighter in weight since you don't need a dedicated differential.

The differential and the transmission both share the same lubricating fluid. It's very important to make sure that the fluid in your transmission is at the proper level, otherwise your transmission will experience significant wear. The synchro rings and sliders all depend on a slick surface in order to match speeds when shifting. If your transmission is low on oil, the wear on these components will accelerate significantly. In addition, shifting the car will be more difficult. One of the first things that you should check on a Boxster that is having problems shifting is the level of the transmission oil. Keeping the differential and all the associated gears well lubricated should also help increase your fuel mileage.

The transmission oil also helps to keep temperatures down inside your transmission. The engine is one of the primary sources of heat for the transmission as it conducts and radiates through and around the points where the engine and transmission are mounted. The transmission also creates heat itself as the gears and synchros turn within its case. Keeping the transmission fluid at its proper level helps to mitigate heat problems. Having a large reservoir of oil to spread the heat throughout the transmission helps to keep temperatures down. On some of the higher performance Porsche transmissions, there is even an external transmission cooler that operates similar to the engine cooler.

I recommend that your transmission fluid should be changed every 30,000 miles or about once every two years. This number is a rough estimate, and may vary depending upon your use of your Boxster (track vs. street). There are many moving parts in the transmission, and they have a tendency to drop small microscopic metal particles into the oil. Specifically, the synchro rings wear down slowly over time, each time you shift. While the transmission bearings are not as sensitive to oil contaminants as the engine bearings, they can still exhibit wear from these particles in the oil.

The Boxster transmissions have two plugs for filling and emptying the transmission oil, located on the side and the bottom of the case. The five-speed transmission requires a 17mm hex socket to remove the filler plug, and a 16mm triple-square anti-tamper socket (Hazet 2567-16) to drain the fluid. Both are available in the online catalog at The six-speed plugs are a bit more generic: a 10mm hex socket is all that is required to remove both the drain plug and the filler plug.

The first step in checking or filling your transmission is to gain access to the plugs. Jack up all four corners of the car (Pelican Technical Article: Jacking Up and Lifting the Boxster on Jack Stands), making sure that the car is perfectly level with respect to the ground. Then remove the front plastic engine covers, the lower diagonal aluminum braces and the metal transmission cover (Pelican Technical Article: Changing Automatic Transmission Fluid).

If you are simply checking the level of oil in your transmission, start by removing the filler plug on the side of the transmission. This is the plug that you add fluid to. For the five-speed transmission, take a large paper clip bent it at a right-angle, stick it inside the hole pointing towards the ground, and measure the fluid level on the paper clip. This "mini dipstick" should register transmission fluid at about 11mm below the lowest edge of the filler hole. Make sure you do this when the car is cold, and parked on level ground. If the level is lower than 11mm, then you will need to add some fluid. For the six-speed transmissions, it's a bit easier. Simply stick your finger in the hole and see if you can feel fluid at the bottom level of the hole. If you can feel the fluid level with your finger, then your fluid level is about right, or perhaps will need only a little topping off.

If you cannot feel the fluid level, then you will need to add transmission oil to the case. If you are planning on changing the oil, then remove the plug on the bottom of the transmission case. It's a wise idea to try to empty the transmission oil when the car is warm, as this will make the oil more viscous and it will flow out easier. Make sure that you have a drain pan capable of handling at least 4 quarts of transmission oil. Check the fluid in the pan to see if you see any unusual metal pieces, or grit in the oil. The five-speed transmission holds about 2.25 liters (2.4 quarts), and the six-speed transmission holds 2.8 liters (3.0 quarts).

While the fluid is emptying out, you can use this time to clean out the drain and filler plugs. The bottom drain plug should have an integrated magnet in it that traps metal debris. Using a cotton swab or a paper towel, carefully clean out all of the black debris and particles that may have found their way in there.

Replace the bottom plug on the transmission, but don't tighten it too tightly (18 ft-lbs or 25 Nm maximum). These plugs do not have a tendency to leak (transmission oil is thicker than engine oil). If it does leak later on, you can always tighten it a little more. Now, add transmission oil to the case. The best method of doing this is with a hand operated oil pump. These are available from most auto parts stores and attach to the top of the plastic transmission oil bottle. They work very similar to the liquid soap dispensers you find in most bathrooms. Pump the transmission case full of fluid until it just starts to run out the filler hole. Replace the filler plug and clean up the few drips that might have run out of the hole. Tighten down the filler plug in a similar manner to the drain plug.

The automatic transmission cars also have a differential built-in to the transaxle. This differential uses the same type of fluid as the manual transmission and must be checked and filled in addition to the automatic transmission fluid. On the automatic cars, there is no drain plug however, so the gear oil must be drained by loosening the outer differential cover (see Project 39 and Figure 5). Or, you can possibly get around this by inserting a fluid vacuum pump into the fluid fill hole and sucking out all of the old fluid. You top off the fluid and fill the differential in a similar manner to the six-speed transmission. Simply unscrew the plug and fill until the fluid starts flowing out of the hole. The automatic transmission uses the same fluid as the manual transmissions and takes about 0.8 liter (0.85 quart). Tighten up the drain plug to 22 ft-lb (30 Nm).

In many cases, generic transmission gear oil that meets or exceeds SAE 75W90 will suffice perfectly fine. Also very effective are the Porsche factory lubricants (typically manufactured by Shell Oil), or Mobil Delvac Synthetic Gear Oil 75W-90. In addition, if you have a Limited Slip Differential (LSD), be sure that you get transmission fluid that is appropriate: using a fluid that is too slippery can reduce the torque bias effects of the differential and make it less effective at distributing torque.

This photo shows a typical 5-speed Boxster transmission that has been removed from the car.
Figure 1

This photo shows a typical 5-speed Boxster transmission that has been removed from the car. You need a special hex socket in order to remove the filler plug located on the side (17mm for the 5-speed and 10mm for the 6-speed).

The inset photo shows the 17mm hex socket tool along with the special 16mm triple-square anti-tamper drain plug removal tool required for the 5-speed transmission.

The 6-speed requires only a 10mm hex socket. For the 6-speed, the fill plus is located on the side of the gearbox toward the rear of the car. (Sorry pic not available at this time.)

The lower inset photo shows the transmission being filled using a hand pump.

Here's a photo of the five speed transmission from my Boxster being reinstalled.
Figure 2

Here's a photo of the five speed transmission from my Boxster being reinstalled. With all of the exhaust components out of the way, it shows a clear view of where the drain plug is located in relation to the rest of the transmission (yellow arrow). The inset photo shows a close-up of the wacky plug that requires the triple-square removal tool. I'm not sure what the motivation was for Porsche to use such a specialized plug here.

The five-speed transmission should be filled approximately 11mm below the bottom edge of the fill plug in the side of the transmission.
Figure 3

The five-speed transmission should be filled approximately 11mm below the bottom edge of the fill plug in the side of the transmission. Use a paperclip as a mini-dipstick to measure the level inside the transmission, as shown here in this diagram.

Shown here is the side of the automatic, Tiptronic transmission for the Boxster.
Figure 4

Shown here is the side of the automatic, Tiptronic transmission for the Boxster. The green arrows point to the differential cover bolts that need to be removed in order to loosen the cover and drain the differential gear oil. If you can't empty the differential by simply loosening the cover bolts, then you need to remove the center bolt and pull out the stub axle. The red arrow points to the fill plug. Top off the fluid to the edge of the bottom of the fill plug, just like on the six-speed transmission.

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Comments and Suggestions:
ian Comments: I was just getting to this project- on my '03 6-spd Boxster S. Thanks a TON for the photo of where the fill plug is... I saw it underneath the car, then second-guessed and was going to go for the plug near the top of the differential housing. Phew! Great book, great info- thanks.
April 11, 2017
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
Chris. Comments: In GM LSDs you need to add a 'Frictin Modifier', it comes in a small bottle, you add it to the gear oil if you have a LSD, or it may not work well. No advice in the article on what to add? why bother writing the article if you only give 1/2 the information?
September 14, 2016
  Followup from the Pelican Staff: You didn't mention what model you are referring to, so I can;t check the info. BUT for late 987 models, Porsche lists the following:

Manual transmission

Type SAE 75w/90
Burmah (TAF 21) 20 liter container N 052 911 C0
Mobil (Mobilube PTX) 20 liter container 000 043 204 20
Shell (Transaxle) 20 liter container 000 043 204 19
Shell (Transaxle) 1 liter container 999 917 546 00
Note: Burmah (TAF 21) is not approved for used in Boxster S manual transmissions - Nick at Pelican Parts
Chris Comments: Just wasted 45 mins looking for the fill plug plug on the 6 speed. 101 Project has no pics of it, and has the location advised wrong. Genius.
September 13, 2016
  Followup from the Pelican Staff: Where did you find it? I can have the article updated.

My info says near the axle as shown. - Nick at Pelican Parts
Eric Comments: I have a 2004 boxster s, after filling 3 litres of oil, still not dripping from the fill plug hole? Should I add more? Can I over fill the transmission?
March 16, 2016
  Followup from the Pelican Staff: You can overfill it. But if following the fill procedure, fill until you reach the right amount. If needed, measure the amount drained to add confidence in the amount being added. - Nick at Pelican Parts  
bastion Comments: Hi. I would like to know what the color, and viscosity of the transmission oil is on a 2000 Boxster non-S with a 5 speed MT. I am other threads where there is confusion on this. I ask because I think my transmission may have gotten a bit hot, and suddenly i've got this fluid on the tranny; it's amber colored lighter than motor oil and maybe a bit thinner than motor oil. Thanks!
February 9, 2016
  Followup from the Pelican Staff: 75 - 90w. Color will vary depending on manufacturer. Not black. - Nick at Pelican Parts  
1stSP Comments: Hello,
You sent me a link this morning with your response to my questions that I sent yesterday. Unfortunately, the link does not seem to work.
January 5, 2016
  Followup from the Pelican Staff: The links are LONG, you will have to copy and paste the entire thing into your browser. or use the part look up tool on the right side of the page, or Give our parts specialists a call at 1-310-626-8765 - Nick at Pelican Parts  
White987Boxsta Comments: 2006 boxster 987 tiptronic non-S.. what size socket would I need for the fill plug? Is it on the passenger side or the drivers side? How do I know if I have LSD? would 75w90 do? thanks!
January 3, 2016
  Followup from the Pelican Staff: 17mm for the 5-speed and 10mm for the 6-speed

Auto transfluids for your vehicle are here:">"> %3Futm_source%3DSuperTech%23item2

LSD checking
List and support the rear of the vehicle. Spin a rear wheel, if the opposite side spins in the same direction, it is an LSD.- Nick at Pelican Parts
BAM Comments: Where are the steps?
December 10, 2015
  Followup from the Pelican Staff: For what? - Nick at Pelican Parts  
Porsche Lover Comments: I have a 1999 Porsche Boxster, that today while driving I could not get it to go in gear. As I slowed I was able to get it engaged. is this a common problem and what should I look for? It seems to hesitate going into 2nd gear. Any suggestions?
July 27, 2015
  Followup from the Pelican Staff: Assuming a manual. Inspect the shift cables and trans fluid. - Nick at Pelican Parts  
Frank Comments: Just changed the transmission fluid in my 2002 base Boxster. No where do I read to add the limited slip additives. How do I know to do so or NOT??
Please respond asap
July 18, 2015
  Followup from the Pelican Staff: You can use your VIN to determine the right parts.

For a fast help;

Give our parts specialists a call at 1-888-280-7799. They can help you figure out the right fluid. - Nick at Pelican Parts
Edster Comments: NIck...thanks for the suggestion. It worked. I did have to use a ratcheting strap, tho. Even tho the car tracks straight, the steering wheel is now off a few degrees. Do I still need an alignment? They're anywhere from $180 to $280 here in Arizona.
December 31, 2014
  Followup from the Pelican Staff: I would have it aligned. It is cheaper than replacing your tires in a month. - Nick at Pelican Parts  
Edster Comments: Hello...I just changed the transaxle oil in my 2001 Boxster 2.7. I backed up my car on ramps rear tires, Then, I jacked up the front and put ramps under the front tires. I had a bit of difficulty removing the transaxle cover, but not too bad. After I changed the fluid, I absolutely could not get the holes on the transaxle cover to match up...specially the ones under the diagonal links. The holes are now off by about 3 mm. So, I rolled the car off the ramps and jacked it up on the rear jack points. No change. I'm tempted to ream out the holes on the plate just so I can install it. Then, I can drive it to an alignment center and have it aligned. Then, they can install a new cover plate. What else can I do?
December 30, 2014
  Followup from the Pelican Staff: Don't make the holes larger. The vehicle's wheels have to be off the ground for it to line up. Jack the vehicle, and try again. - Nick at Pelican Parts  
Scuderia 928 Comments: Can a 5 spd Stock transmission withstand the Power/torque of a 3,8 engine on a 1997 porsche boxster? Ir not, watching is your best recommendation on This subject? The engine is custom built and the will be used at DE,s at Sebring, daytona and road atlanta. Thank you for your time.
December 27, 2014
  Followup from the Pelican Staff: I don't see why it couldn't, but I can't be 100% sure.

I opened a post in our forums. A Pelican community member may be able to answer your question.
- Nick at Pelican Parts
428Street Comments: This post is based strictly on fear : So I'm looking to replace the MTF on my 01 S 6 speed and have read this DIY and on other sites. The drain and fill seems pretty straight forward. What scares me is disrupting the plate and braces as I've read that they have to do with the alignment and taking them off will possibley cause you to have to get an alignment. There is also talk about using a racket and strap to keep the pressure on the two brakets that the braces mount to. Also read good and bad about drilling the hole to make the process easier. If you install the technobrace and drill the hole is that a good compromise and upgrade for suspension? Sorry for all the questions.
November 22, 2014
  Followup from the Pelican Staff: Don't drill a hole. There is no need for a strap.

Mark the plate positions and re-install them where they came off. If you an alignment problem, have one performed. I would think you won't need one after. - Nick at Pelican Parts
Kevin Comments: Hello, on a 2002 Boxster 2,7L 5 spd, do the rear wheels need to be off the ground before removing the aluminum plate and supports or can i remove these while the rear of the car is on ramps? I'm not sure if removing these 14 bolts will result in the rear of the car falling with me under it.
November 7, 2014
  Followup from the Pelican Staff: The vehicle should be off the ground. - Nick at Pelican Parts  
AllBus Comments: How much oil for a 05 987 5spd? I am buying the trpl sq bit on amazon right now. How much is expected to be drained out?
November 3, 2014
  Followup from the Pelican Staff: I think it holds 3, going by memory. Have four on hand in case you spill some. - Nick at Pelican Parts  
billy192 Comments: what size is the bolt you need to remove from the center of the stub axle from the gearbox when replacing the oil seal.
September 19, 2014
  Followup from the Pelican Staff: Use the axle bolts and tighten them against a chisel to press it out. - Nick at Pelican Parts  
bigblock Comments: Hi, i own a 2003 Boxster S with a G86.20 6 speed MT. Changed the transmission oil on a hydraulic leveled ramp. Didn't check the volume while draining. Put 2.9 liters in, but the oil didn't overrun. Tested oil level with finger, but it was still below the hole where you fill in the oil. So i'm wondering if this transmission needs more transmission oil. Thanks
June 20, 2014
  Followup from the Pelican Staff: 3 should be enough if you just drained and filled. However, I would recommend topping up until you are at the correct level. It's even worth getting it right, then rechecking after driving. - Nick at Pelican Parts  
AlexC Comments: My car is on a lift as it has been stored for winter since December. Would you still recommend changing the oil with the tranny warm or is there value to doing so in its current state as ALL of the oil has certainly dripped off of higher components and is in the bottom of the unit. AKA: Is it worth splitting hairs in this case to have the tranny warm? Thanks!
March 29, 2014
  Followup from the Pelican Staff: You should be Ok keeping it cool. Warming it allows the fluid to drain down, and drain faster. If yours has been sitting, I don't see the need. - Nick at Pelican Parts  
MannyV Comments: I have a 1998 Porsche 986 Boxster with tiptronic 5 speeds transmission. Recently started to leak in the right side. The oil seems to come out somewhere through the shaft flange. I believe a seal is damaged but don't know which one and how to change it. Can you help me with this pls.
March 22, 2014
  Followup from the Pelican Staff: Could be the stub axle seal in the gearbox. You will have to remove the axle, then the stub axle. Then replace the seal. - Nick at Pelican Parts  
Mars_Pel Comments: 1. I have just bought a 2002 manual 5 speed Boxster. It would be easier to change the transmission oil if the alloy cover under the transmission had a 2 inch hole drilled through it directly under the plug. Is there any reason why this should not be done?
2. The drain plug is off to one side of the transmission. If it can be done, does anyone have exact measurements for the location of the centre of the drain plug in relation to the centre of the transmission, or better still the edges of the plate laterally and longitudinally, or even better still, lat and long in relation to the existing small 3/8 inch drip hole in the entre of the alloy plate?
3. If this idea is feasible and doesn't compromise the car in any way, it would save owners and garages a lot of time. The 2 inch drilled hole could be filled with a rubber or plastic plug between oil changes. It seems so obvious there MUST be a reason the Porsche engineers didn't design an oil change hole in the plate themselves. If it is feasible, I suggest the transmission drain hole could be documented as one of your minor projects.
3. Congratulations to the Pelican web site creator and developers. It is a great source of information.
January 29, 2014
  Followup from the Pelican Staff: The pan is for structural support, do not modify it. - Nick at Pelican Parts  
Tucker Comments: Did this today. Used the Swepco 201 tranny fluid.
Few notes:
-My tranny cover was very easy to remove. As was both drain and fill plugs.
-I made a total mess with the extension tube on the piston filler launching itself off. Had to hold that in place while pumping the new tranny fluid it.
-first few shifts after the change were scary...I mean scary bad...but 3-4 blocks down the road and everything was great. Much better shifts and generally smoother all around. Very happy now with this project as it has fixed my 1st to 2nd sketchiness I've been having.
December 12, 2013
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
ganseg Comments: Mine is a 2002. It would be helpful to hear if any that old had LS. Thanks.
June 19, 2013
  Followup from the Pelican Staff: I believe in 2002 Boxster models were available with PSM traction control, which was described at LSD in the option code. However, I also remember it not being a true LSD. You can always install one yourself. - Nick at Pelican Parts  
ganseg Comments: Is the differential Limited Slip? Would Mobil1 75W90 LS be a good fluid? Thanks for the helpful articles!
June 18, 2013
  Followup from the Pelican Staff: A limited slip was optional in Boxster models. Give our parts specialists a call, they will help you choose the right oil. - Nick at Pelican Parts  
just_me Comments: I'm looking at wayne's "correct" photo of the fillplug for the 6-speed. Something seems wrong:

1. either the photo is reversed, or
2. it suddenly on the passenger side again, or
3. this is a 996 and the tranny is reversed

Can you clarify?

April 20, 2013
  Followup from the Pelican Staff: Sorry for the confusion, the photos only show the 5-speed transmission. - Wayne at Pelican Parts  
just_me Comments: For clarity, the reason the 5-sp is different in fill level, fill hole location etc is that it is in fact an Audi 01E transmission, not a porsche unit at all. From what i can tell, this is a *good* thing.

It requires the M16H triple square security socket.

April 20, 2013
  Followup from the Pelican Staff: Thanks for the info. - Nick at Pelican Parts  
Jim Comments: Just completed this project on a '02 Boxster S 6 speed which is low mileage & had never had the trans oil changed. A few observations that might help others:
* Metal transmission cover required a bit of force to remove after removing nuts.
* The Boxster 6 speed fill hole is on the driver's side Wayne's pic of the 996 6 speed shows it is on the passenger side. Mine required a lot of force to remove galled. Used penetrating oil PB, a hammer on a flat punch to the center of the plug, and a breaker bar with a 10 MM hex socket to remove it.
* Used anti-seize paste on threads of fasteners to make the job easier next time.
November 7, 2012
  Followup from the Pelican Staff: Thanks for the additional Info. We appreciate it. - Nick at Pelican Parts  
Randy Comments: My 2004 986 is showing the "Check Engine Light" and a rocking, rotating light/indicator runs back and forth between high and low gears. This is an automatic transmission. An engine sensor read out says "Transmission shifter solenoid circuit malfunction". I cannot find anything on line about repairing this. Any one have a clue please?
October 4, 2012
  Followup from the Pelican Staff: This is a fault code for a solenoid in the transmission. You will need a Porsche scann tool, the wiring and test tools to diganose it. You'll want to operate the solenoid with the scan tool and see if it is actuating. If not, then check the control signal to the solenoid. - Nick at Pelican Parts  
usmcxsv Comments: on a 99 boxter will a 5 and 6 speed bolt up the same to a 986
April 19, 2012
  Followup from the Pelican Staff: If I remember correctly, on M96 motors, the bolt pattern is different, but both will bolt up. - Nick at Pelican Parts  
Smokestack Comments: Souldn't the drain procedure read to drain the oil with the car warm as the oil will be less viscous. It states the oil will be more viscous warm.
December 11, 2011
  Followup from the Pelican Staff: Yes, you can do that and it will in general drain more fluid out. You just need to be very careful working around any hot exhaust components. With engine oil, it's easy to reach all of the drain plugs. With the transmission - not as much. - Wayne at Pelican Parts  
Wayne at Pelican Parts Comments: Here's another photo of the drain (yellow) and fill (purple) plugs on the six-speed transmissions.
September 5, 2011
  Followup from the Pelican Staff: - Wayne at Pelican Parts  
rpjasin Comments: This article is confusing on the 5 speed transaxle. Why do you state "Pump the transmission case full of fluid until it just starts to run out the filler hole", and later in the article it states that the oil should be "11 mm below the plug opening"? Please explain, Thanks!
August 23, 2011
  Followup from the Pelican Staff: Sorry about that, you're right. That's for the six speed (fill until it runs out of the hole). The 5-speed should be a little bit less. I don't know why Porsche made it this way, nearly every other transmission on earth does it where you fill it up to the bottom of the filler hole. - Wayne at Pelican Parts  
adkmini Comments: Just a note that the 6 speed Boxster S FILL plug is on the DRIVERS SIDE on the gearbox end of the transaxle, almost at the back of the car. You can actually access it to top off without removing anything.
It is NOT on the round differential housing cover like the 5 speed.
There is, what looks like a fill plug, on the passenger side round differential housing cover - this is not correct. Don't ask me how I know ........
August 7, 2011
  Followup from the Pelican Staff: Indeed, this is in a different spot. I have a photo from the upcoming 996 book, which basically uses a similar transmission as the Boxster 'S'. I will post that photo here. - Wayne at Pelican Parts  
Hal Comments: Can I use my Mighty Vac to suck the transmission oil out of the fill hole instead of draining from the bottom. I know the oil is thick, but if I do it shortly after driving it should be more fluid right? Just checking to make sure I can reach the bottom of the sump with the Vac.
January 9, 2011
  Followup from the Pelican Staff: I don't see why that wouldn't work, but you will not get all the fluid out. You'll have to get a flexible extension and insert it into the tube, like is shown in the photo above. - Wayne at Pelican Parts  
Wayne at Pelican Parts Comments: JJ, here's a photo of the drain plug on the six speed transmission.

December 12, 2010
  Followup from the Pelican Staff: Thanks Wayne - Nick at Pelican Parts  
JJ Comments: Wayne I am trying to find the filler plug on my 6 speed 986. Can you tell me where that is? Thanks.
December 9, 2010
  Followup from the Pelican Staff: JJ, see the photo above that Wayne shared.- Nick at Pelican Parts  
Porsche 986 Comments: Hi.
I went with my 1997 Boxster 2.5 5 speed manual to a workshop to change the engine oil.
I also told them to verify the level of the oil in the transmission/differential.

They verify that the level was low below the hole and add about one quart of oil. There were no visible signs of leaks.

But you say that "This “mini dipstick” should register transmission fluid at about 11mm below the lowest edge of the filler hole"
So probably the mechanics didn't know that and when they saw that the level was lower than the oil, they filled until the fluid started to flowing out of the hole.

Do you think that there is any problem in the excess of oil?

September 21, 2010
  Followup from the Pelican Staff: It pays to go to shops that know about the cars! :) The transmission level is too high now. I'm not sure what the problems might be, but I would take it back to them, and have them take out the quart that they added (in their error). Tell them to look in the factory manuals (they probably don't even have a set?). - Wayne at Pelican Parts  

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