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Pelican Technical Article:

DIY oil change on a 993


1-2 hours






15mm 6 point socket, 15mm box end wrench, 13mm socket, 10mm socket, ratchet, large flathead screwdriver, medium phillips screwdriver, oil filter wrench, floor jack, jack stands, torque wrench, large oil pan.

Applicable Models:

Porsche 993 Carrera (1995-98)
Porsche 993 Carrera 4 (1995-98)
Porsche 993 Carrera 4S (1996-98)
Porsche 993 Carrera S (1998)
Porsche 993 Targa (1996-98)
Porsche 993 Turbo (1996-97)

Parts Required:

900 123 118 30 Seal washer for oil tank drain plug (22x27mm), 900 123 118 30 Seal washer for engine drain plug (22x27mm), 999 701 269 40 O-ring for oil tank drain plug (11X2.5 mm), 993 107 203 02 Engine oil filter, 993 207 201 01 Oil tank oil filter.

Performance Gain:

Maintains peak engine lubrication performance.

Complementary Modification:

Adding additional oil coolers to oil system can help keep optimal temperature during spirited driving sessions.

DIY oil change on a 993

This DIY project in the skill level of 1-10 (10 being the hardest) it is a 6.  To increase the download time I will only post minimal numbers of pictures and the rest can still be access by click on the underlined links on the word. 

Some of the most important tools and items needed for this DIY is a oil filter socket, and over sized drain pan.

There are two oil filter in the 993 engine, Porsche added an additional oil filter on the 993 engine to provide extra filtration of the oil for the protection of the hydraulic lifters. 

Parts you will need to replace on this DIY:
About 11 quarts of Mobile 1 oil, (Or the oil of your choice)
900 123 118 30 Seal washer for oil tank drain plug, 22x27mm 
900 123 118 30 Seal washer for engine drain plug, 22x27mm
999 701 269 40 O-ring for oil tank drain plug, 11X2.5 mm 
993 107 203 02 Engine oil filter
993 207 201 01 Oil tank oil filter

Tools needed for this DIY:

15 mm 6 point socket (can damage drain plugs with 12 point)
15 mm box end wrench (6 point preferable, if you can find one)
13 mm socket
10 mm socket
Large flat-head screwdriver
Medium Phillips screwdriver
Oil filter wrench 
Hydraulic floor jack
Jack stand
Torque wrench
Large oil pan

(1). Jack your car up on 4 jack stands,  please refer to "How to jack your car up" section for details.  Remove the right rear wheel.

(2). Remove the 4 philips screws that holds the plastic panel on the bottom right side of the car.  And unbolt the 10 mm plastic bolts that holds the entire panel on the bottom right side of the car.  Pull the cover off around the jack stand position area, and pull down the side panel, you will not need to remove the panel completely to access the oil tank drain plug and oil tank filter.

(3). Remove 1 10 mm plastic bolt in the rear wheel well area.  Pull the wheel well panel back to gain access to the oil tank filter.

(4). Place the large oil pan underneath the oil tank drain plug and unbolt the drain plug.  Remove the oil tank filter through the rear wheel well panel opening that has been pull back.  After you have drained the oil from the oil tank, install new filter (long one).  Replace the washer on the oil tank drain plug, install the drain plug tighten to 40 ft lb of torque.  It is a good practice to check if the rubber seal has fallen off the old oil filter and are stuck on the engine before you install the new one.  This used to happen a lot back in the old days, sometime the new filter are installed with the old oil rubber seal still stuck on the engine case, we call it "Double gasket".  Leaking will occur when that happens.  Also when installing the new filter make sure you don't over tighten. Since you will be using the oil filter socket you will tend to over tighten the filter.  Remember they were suppose to only be hand tighten.

(5). Remove the engine undertray and the transmission undertray.   Dzus style fasteners; 1/4 turn unlocks and releases the screws that holds the engine undertray up.  For the transmission undertray you will need to slide the panel out toward the rear of the car. 

(6). Place the oil pan under the engine drain plug, and unbolt the drain plug to drain the oil from the crank case.  When complete replace the washer and bolt the drain plug back on at 40 ft lb of torque.

(6). Remove the right side ventilation rubber hose and "r" shaped ventilation door.  There are a total of three straps you will need to loosen.  The rubber hose connects up, the picture on the right shows where the strap needs to be loosen to remove the rubber hose.

(7). Unbolt the oil return line under the second small oil filter.  In order to remove this filter you will need to move the oil return line out a way.  (A trick told by a Porsche mechanic)  It is possible to remove the oil filter without moving this tube, but it is easier this way.  The left picture shows how the oil return line blocks the oil filter from dropping straight down.  There is only one bolt that holds the oil return line on. (center picture) Place  the oil pan underneath this line before it is pull out of the engine case, oil will come purring out of this line once it is pulled out.  In order to remove the oil return line out from the engine case you will need to use a flat screw driver slowly and carefully pry out the oil return line from the engine block once the bolt is removed. (The right picture shows how to pry it out)

(8).  Remove the small filter and replace it with a new one.  Reinstall the oil return tube.  And the rubber ventilation tube and hose.  Pour 9 quarts of oil in first, start the engine check the oil level and pour more if needed.  I usually end up pouring 10.5 quarts of Mobil 1.  The pouring process gets back up once you get about 8 quarts in the oil tank, you will need to slow down the pouring process or back up will occur.......

If you followed the above procedure exactly you will need to put in 10.5 quarts of oil.  This should save you sometime to figure out how many quarts of oil to put in.  With 10.5 quarts the needle for oil tank level gauge on tha dash will point at 3:00 colock position once the car is fully warmed up and oil thermostate open. 

During this DIY I broke a new personal record in changing the oil, 1 hours including the time spent to take these pictures. 

December, 2001

There were some talks recently about the Mobil 1 Euro grade 0w40 oil.  So I was curious and purchased 12 quarts of the stuff from my local Porsche dealer (the only place that seems to carry them at this time)  At a whopping rate of $6.26/quart.  Just to fill you in on the complete story, I usually change to a lighter weight Mobil 1 oil (Green label bottle) right before the winter months, and change back to the 15w50 oil right before Summer.   I thought this would be a good opportunity for me to try out the 0w40 weight oil to see how it performs.   

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Comments and Suggestions:
JS Comments: I recently had an oil/filters service done at a local shop on my 1998 C2S. I am wondering if the oil may have been over filled. Fully warm, idling, and level, the dipstick looks ok, but I clearly see oil in the lower section of the fill tube, and the gauge reads between one and two o'clock. Is this normal?
July 6, 2016
  Followup from the Pelican Staff: I think it should be at 3 when full and warm. I would double check the level. - Nick at Pelican Parts  
GT3'er Comments: Didn't see any mention of where the "rubber o-ring for tank drain plug" gets installed. Is it for the plug, or filter? Will it be obvious?
Thanks for a nice write-up.
December 7, 2015
  Followup from the Pelican Staff: What vehicle are you working on? - Nick at Pelican Parts  
NoRush993/951 Comments: Wayne
Is there a construction difference between the large Porsche oil filter and the Mahle version? Does the Mahle filter have an additional check valve to prevent back flow? Was the check valve eliminated from the Porsche made in USA filter? I know you are the expert and appreciate your insight.
October 10, 2015
  Followup from the Pelican Staff: I am not 100% sure. I would think are they are pretty similar in design, as Mahle makes a lot of the OE filters. - Nick at Pelican Parts  
Drew Comments: I'm viewing this on an iPad and the annoying pop up that is on the right of the screen covers some of the text and photos. This is the pop up that prompts you to order the parts. Can that be closed so I can follow the directions?
October 9, 2015
  Followup from the Pelican Staff: I don;t know, I don;t have an ipad to try with. I will forward your note to the web team. - Nick at Pelican Parts  
Bobby Comments: I change my oil on my993. I just notice the oil from where i refill and reservoir are not the same color. Looks like it's not cycling properly. Any suggestion? Thanks
August 16, 2014
  Followup from the Pelican Staff: How are you determining the color of the oil in the filler neck? The tank thermostat could be faulty. - Nick at Pelican Parts  
Ken Comments: I am looking to change the oil on my 964, is there an article that I can use to assist - I've seen both the 911 and the 993 articles, which is better for the 964?
April 23, 2014
  Followup from the Pelican Staff: Depends on the year of your 964. I would think both would get you close, but not be exact. I would grab a repair manual if you haven't performed this repair before. - Nick at Pelican Parts  
pablo Comments: changed my oil on my 1995 porsche 911 933for the first time , when i loosened the drain plug from the bottom of the engine out fell out 2 cylindrical parts. 1 short and 1 long , what do these parts do ? i poured 10 qts. of oil , the oil light came on , so i poured 1 more qt. checked the dipstick nothing poured another qt. still nothing , thats a total of 12 qts. is that too much oil ? dont want to damage anything , what should i do ?
October 15, 2013
  Followup from the Pelican Staff: 10 is what I start with and check it from there. Can you share a photo of the parts? - Nick at Pelican Parts  
JB Comments: I have 2004 911 996, does it have one oil filter or two?
June 23, 2013
  Followup from the Pelican Staff: There is one cartridge style oil filter. - Nick at Pelican Parts  
JB Comments: When the first oil change was done at the dealer on my 2004 911 for $810.00+++ : They had a large sheet with parts on it that looked like a bunch of brass fittings and such. Any Idea what that was for and does it need it again?
June 22, 2013
  Followup from the Pelican Staff: They may have replaced other parts during the service. Can you share the part numbers? - Nick at Pelican Parts  
JK Comments: Is this pretty much the same approach for a 1997 9119934S coupe.
February 22, 2013
  Followup from the Pelican Staff: Thanks for the additional Info. We appreciate it.
- Nick at Pelican Parts
Q8drill Comments: I am looking for a manual for 993 1996 Targa
I want to be able to work on my car.
November 24, 2011
  Followup from the Pelican Staff: manuals are here:
https://www.pelicanparts.com/catalog/shopcart/911L/POR_911L_TOLbks_pg3.htm#item18 - Nick at Pelican Parts
Ryan Comments: I'm a factory Audi technician, we took a 993 C4S in on trade, had to change the oil for resale. Thanks for the great instructions!
November 17, 2011
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
JD Comments: front oil cooler is not warming up,should i open the valve with my wifes hair dryer?
October 24, 2011
  Followup from the Pelican Staff: When are you checking it? The thermostat may not have opened yet. - Nick at Pelican Parts  
Mike Tran Comments: No it is not the same for 996, The 996 is a lot easier. It's easier then changing the oil on a honda :
May 16, 2011
  Followup from the Pelican Staff: Thanks for the feedback.
- Nick at Pelican Parts
aigel Comments: The removal of the oil line is not necessary. Use a plastic filter socket and have some patience maneuvering it past the line on the way in empty and on the way out with the filter on it. Reverse order for reinstalling the filter.

Have fun!
February 2, 2011
  Followup from the Pelican Staff: Thanks for the input on this one. We appreciate the help.
- Nick at Pelican Parts
Peter Comments: I am looking for a manual for 997 2008 Targa
I want to be able to work on my car.
January 1, 2011
  Followup from the Pelican Staff: Sorry, but Porsche doesn't publish manuals any more for the newer cars. You need to get the info out of the PIWIS system, which is only available through dealers. - Wayne at Pelican Parts  
johnz Comments: Porsche oil change how many liters to put
December 30, 2010
  Followup from the Pelican Staff: What year and model? - Nick at Pelican Parts  
larrya Comments: The owner's manual for my 1995 993 calls for an oil change every 15,000 miles. Any thoughts on why Porsche would recomend this? Seems way too long.
November 13, 2010
  Followup from the Pelican Staff: The environmental agencies around the world have been pressing manufacturers to lengthen the oil change intervals in order to reduce the amount of waste oil that needs to be recycled. I prefer to change the oil every 5,000 miles max. These days, it's not the oil that is breaking down, but it can get contaminated by gasoline leaking past the piston rings. Frequent oil changes are still very good for the car. - Wayne at Pelican Parts  
david Comments: thanks, one more question, if I am going to change at every 3k, anything wrong with using Castrol or some other "organic" non synthetic oil?
August 27, 2010
  Followup from the Pelican Staff: Nope, not a problem. These days, the non-syn oils are just as durable as the synthetics. Frequent oil changes with regular Castrol should be fine. - Wayne at Pelican Parts  
David Comments: how often should I change the oil in my 95 993? I use mobil 1 and add a quart every 700 miles, so theoretically after 7000 miles the oil has 3500 miles on it. that logic requires one to assume that every 700 miles the car has used half a quart of old oil and half a quart new oil. that may be quite a stretch, no doubt. ps engine is strong at 97k miles, no smoke or leaks. Thanks, David
August 25, 2010
  Followup from the Pelican Staff: It's not typically the oil that wears out and gets old - it's the fact that it gets contaminated by gas and debris. So, you want to change the oil to empty that out. I recommend every 3,000 miles, with every 5,000 miles being the max. - Wayne at Pelican Parts  
Michael Drayton Comments: I congratulate you on such clear, well-documented instructions which I found most helpful for the latest oil change.
June 18, 2010
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts

March 17, 2010
  Followup from the Pelican Staff: This article should help you out:

http://www.pelicanparts.com/techarticles/Boxster_Tech/02-BASICS-Oil_Change/02-BASICS-Oil_Change.htm - Nick at Pelican Parts
wutz Comments: Is this process the same for a Turbo? What about parts numbers?
March 12, 2010
  Followup from the Pelican Staff: It is similar. The drain plug is slightly different. Prts are here:

http://www.pelicanparts.com/catalog/shopcart/911L/POR_911L_ENGoil_pg1.htm #item0 - Nick at Pelican Parts

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