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Rear Differential Oil Change
 
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Pelican Technical Article:

Rear Differential Oil Change

Jared Fenton

Time:

1 hour1 hr

Tab:

$50

Talent:

***

Tools:

8mm hex driver, drain pan, gloves, hand pump

Applicable Models:

Porsche 955 Cayenne (2004-10)
Porsche 955 Cayenne GTS (2008-10)
Porsche 955 Cayenne S (2003-10)
Porsche 955 Cayenne Turbo (2003-10)
Porsche 955 Cayenne Turbo S (2006-10)

Parts Required:

ATF, new drain plugs

Hot Tip:

Make sure you have a drain pan with a large enough capacity

Performance Gain:

A quieter, smoother and cooler running final drive

Complementary Modification:

Replace front differential oil.

In this article, I will go over the steps involved with changing the rear differential oil on your Porsche Cayenne. Changing the oil is not a difficult job, but can be a bit messy. It is advisable to lay down a plastic tarp or sheeting underneath the car to catch any possible spills. You'll also want to have a drain pan with a capacity of at least five liters to be on the safe side. When filling the rear differential, you'll need roughly one liter of Porsche approved Automatic Transmission Fluid (ATF). The factory part number for one liter of fluid is 000-043-205-28.

Begin by jacking up the Cayenne and securing it on four jackstands (See our article on Jacking Up Your Cayenne for more information). This is both to gain clearance to the rear differential and also to keep the Cayenne level. This is important. If you do not have the car level, it will affect the measurement for filling the differential back up. Note, if you have air suspension on your Cayenne, it is possible to gain enough clearance to access the transfer case by putting the suspension to its highest setting.

Note that Porsche recommends replacing the drain plug seals each time you remove the plugs. At this time it appears that Porsche is only selling the seals with new drain plugs. (part number 955-332-057-00). I would visually inspect each seal first for damage or wear before automatically replacing it.

Shown here are the drain (yellow arrow) and fill (green arrow) plugs on the front differential.
Figure 1

Shown here are the fill (yellow arrow) and drain (green arrow) plugs on the front differential.

Begin by using an 8mm hex key to remove the fill plug from the rear differential as shown here.
Figure 2

Begin by using an 8mm hex key to remove the fill plug from the rear differential as shown here. Once removed, move to the drain plug below and remove it. Let the differential drain completely. Inspect the sealing ring on the drain plug. Now replace or reinstall the plug and torque it to 35Nm (26 ft/lbs.).

Use a hand pump to fill the differential with ATF until it just starts to pour out the fill plug threads (green arrow).
Figure 3

Use a hand pump to fill the differential with ATF until it just starts to pour out the fill plug threads (green arrow). Now either replace or reinstall the plug and torque it to 35Nm (26 ft/lbs.).

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Comments and Suggestions:
CIMB Comments: the arrows in the first picture are reversed.
October 30, 2016
  Followup from the Pelican Staff: Thanks for catching that. We appreciate it. I will have the article updated.
- Nick at Pelican Parts
 
Scott Comments: '04 S....pretty sure it's gear oil, not atf.
July 2, 2014
  Followup from the Pelican Staff: You are correct, it is gear oil. I am having the article updated. Thanks for the help with this one. - Nick at Pelican Parts  
Scott Comments: Few things here..

Step 1 you say it's front diff when it's rear
Step 3 you say to fill with ATF. You sure? Wouldn't you put gear oil in this? 75w-90?
June 25, 2014
  Followup from the Pelican Staff: What year is your cayenne? I can double check the fluid spec. I am having someone look into adding a link to the fluid types or the article. I may take some time to respond, due to comment volume, for a faster response, give our parts specialists a call at 1-888-280-7799. They can help you find the right part.
- Nick at Pelican Parts
 

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