aututto

Hey all!

Just wanted to share my shopping list for the drive line flush on CD's since there isn't a ton of info on the diesels. With our 13 CD slowly approaching the 150k mi mark I decided to take care of the drive line flushes.

I DIY'd the diffs and transfer case, paid my favorite shop to do the transmission (I simply don't have the tools to cycle the transmission during the refill process.) The rear diff and transfer case are super easy, you can reach those easily with the car parked at height. The front diff was a little bit of a tight fit (have to remove splash shields for access, and the plugs are in a tight spot), but all three are as straight forward as any diff/t-case flush.

I used all Ravenol fluids. I use them for my oil changes and in our M3 as well, I just really like how their fluids have performed. I didn't notice much of a change after the diffs/t-case. But definitely noticed a slight improvement in shifting after the trans. Steady acceleration shifts are glasslike. They were good before, but flush definitely helped.

Differentials:
- Fluid x2 (Each diff took under 1L): Ravenol VSG 75W90
- Plugs x4 (two each diff): Porsche Diff Plug 95533205700

Transfer Case:
EDIT: It has been mentioned that the 75w90 for the diffs should also be used in the transfer case although p/n's don't match that way. I have reached out to ravenol for confirmation and will update.
- Fluid x1 (Took less than 1L): Ravenol TF-0870 / DTF-1
- Plugs x2 (see note): Porsche Transfer Case Plug 95530111501
- Note: Be careful with the t-case plugs. Take note of how many threads are sticking out on the old plugs before removing (the plugs don't screw down flush, they should have 3-4 threads sticking out).

Transmission:
- Kit x1 (Shouldn't need anything else): Blauparts Cayenne ATF Trans Fluid Kit 2011-18

garrett376

There are a ton of posts/threads about this... and the TF-0870 fluid you used for the transfer case isn't the one specified for Cayenne diesel.

d7101

What is the spec'd fluid for the diesl Tcase?

Quadcammer

standard Castrol 75w90 Syntrax longlife I believe for diesel

aututto

Yes it is. OEM VW fluid is "G 052 536 A2" which cross references to the TF-0870 from ravenol. Its also what blauparts has recommended as appropriately cross referenced.

If you look at the transfer case fluid on FCP, it has the oe vw and porsche cross reference numbers. See here

When I shop for aftermarket fluids/parts that are clearly VW items on the diesel I use the oem VW numbers first. Porsche utilizing its own part numbers doesn't always relay well through the aftermarket brands.

Umber

It's appears that Ravenol has removed the reference for recommendation for 95834153600 on the vsg 75w90 in their online oil selector.
https://www.ravenol.de/en/product/getriebeoel/getriebeoele-fur-schaltgetriebe-und-antriebsachsen/ravenol-vsg-sae-75w-90
Now the DTF-1 has G052536A2 also.. maybe there was some confusion, and they thought it would be easier to recommend one transfer case oil for cayennes..?
The recommendation still shows on this website
https://www.ravenolamerica.com/amp/passenger-car-products/gear-oil-75w90-gl-4-gl-5-ravenol-vsg/

aututto

Could be the case. I would side with the german home website over the USA site.

Could have been an original entry error? Or maybe they had some feedback that 75w90 wasn't working. Not sure, but the t-case fluid was a big reason for me making this thread. Nothing was matching up with the 75w90 everyone was saying

Umber

It even used to be printed on the label

aututto

Dang it sure did! Interesting, I wonder why. I had my concerns about a t case using the same fluid as diffs. That’s not typically the case, they usually use atf or t case specific fluid

garrett376

Per Porsche's documentation, your Torsen transfer case does not use the same fluid as the active clutch transfer case. Do whatever makes you feel happy, but the active-transfer case fluid is not what Porsche specifies for your transfer case, and this should be clear to those who read this post and care to do it as Porsche specified, versus according to your preference or interpretation of aftermarket websites.

d7101

Back to an earlier question.... what is the spec'd fluid for the deisel t-case? Is it just 75w90? Knowing what it isn't, not as useful as knowing what it is... as it turns out

garrett376

As Quadcammer indicated above: synthetic 75w-90 oil.

aututto

I'm going to try and contact a local dealer for VIN specified part no. Then take that to ravenol and get their opinion. I'm finding a couple OEM pn for the toureag TDI but only finding one that cross references with porsche, and that tracks to the TF-0870. Aftermarket doesn't seem to utilize the porsche fluid numbers just VW in most cases. To top it all off I see ravenol even has a Torsen specific fluid (thought its very expensive $60).

I tried looking at ravenol's german site and doing vehicle specifc for the CD, though its sort of wonky since it doesn't correlate. They show both TF-0870 and 75w90 for the CD. The OEM pn's match to the TF-0780, but they state 75w90 for torsen.

I'm starting to think these fluids are really similar and just utilize different amounts of friction modifiers, likely more for the clutch based t-case. But FM's wouldn't have any positive or negative effect on a mechanical t-case.

vwbrd

Grrr. I researched this for a long time on this board in 2019 after I got my CD and I ended up going with the Ravenol DTF-1 based on all the same info. In fact, I just re-ordered the same in January and have it still sitting unopened in my garage. I guess at least now I know I can just find some locally and swap it this weekend instead of having to order online.

AnAlbumCover

@aututto, small favor, can you edit your original post and remove the DTF-1/TF-0870 reference. Lots of people read the forums and without reading the whole thread may end up with the wrong fluid for their V6 or Diesel Cayennes.

Just to set the record straight:

• Cayenne V6 3.0T Hybrid and Diesel use straight synthetic 75w-90 gear oil in their transfer cases. I'm a fan of Valvoline for the gear oils.
• Cayenne Base V6 (3.6) S/Turbo, V8 and Turbo use the fancy DTF-1/TF-0870 fluid in their transfer cases.