Correct OEM transmission and differential fluids part numbers

[mbagge01]

I am hoping that someone can help confirm the correct part numbers for the OEM porsche oils for the transmission and front/rear differential. I am finding some differences between the PET catalog and what is on the TSB here on this site. What i have concluded so far is that the front and rear differentials use OEM part number 00004320530 which are 1L bottles of 75W90 fluid. For the transmission I am finding on PET the part numbers 00004320528 and 00004330136 for 1L bottles. The differential part numbers seem to be correct but I am not sure about the transmission fluid part numbers.

[bigbuzuki]

00004320528 is for the tiptronic transmission.

00004330136 is for the transfer case.

[SpawnyWhippet]

When I search for these oils, I find the following:

Tiptronic oil is Titan ATF 4400. Dry fill capacity = 9 liters

Transfer case oil is Shell TF-0870 (SAE75W, GL-4). This is the exact same stuff as BMW X5 uses, and that seems to be about half the price of the Porsche oil. Any reason not to use it instead?

Also, how much transfer case oil is required to do a change? Are there any DIY instructions for this?

My car is throwing errors on the instrument cluster about 4WD system faulty and PSM faulty after long high speed drives, plus Durametric has these errors for the transfer case:

Transfer Case
Current Fault Codes

2025
Power supply - Short circuit to B+, test conditions are not-completed, fault is not currently active and is not causing a DTC light

1314
DME control module - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light

2039
Transfer box potentiometer - Short circuit to B+, test conditions are not-completed, fault is not currently active and is not causing a DTC light

778
Steering-angle sensor - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light

1336
CAN comfort OFF - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light

1316
PSM control module - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light

1317
Instrument cluster - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light

1315
Tiptronic control module - No signal/communication, test conditions are not-completed, fault is not currently active and is not causing a DTC light

[hahnmgh63]

The Transfer case is Esso spec ATF LT 71141, not a hypoid gear oil. Porsche say's the older Cayenne Transfer case fluid was Blue but the newer is standard Red looking. See Porsche Cayenne TSB 2/04 3965 for the specs.

Front Diff: 1 liter Synthetic gear oil

Rear Diff: 1.4 liters Synthetic gear oil or 1.6 liters if equipped with optional rear locking diff, w/friction modifyer.

Transfer Case: 0.85 liters Synthetic ATF Esso spec LT 71141

Tiptronic (2003-2004): 9 liters (8.5l refill) Esso spec JWS 3309 or Toyota Type T-IV.

Many quality Synthetic ATF's can meet or exceed both ATF specs such as Redline D4 (which I use in both). Some lower quality ATF's can meet only one or neither. Look for a quality ATF that is labeled with both or at least the right spec for the right use, ie...Tip or Transfer.