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Transmission Fluid Change at Front Differential?

The Beanster

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  • 5 months later...

Loren can answer your questions more accurately and definitively, but I believe the fluid replacement interval is ~60K miles and the gear oil is Mobilube PTX.  Loren will correct me if I'm wrong on that I'm sure and he's the go-to on the official source.


I just wanted to tell you as friendly advice (and maybe you already know this) -- I speak from deep experience on this topic -- don't even think for a millisecond about using anything except the OEM fluids on these gearboxes.  It doesn't sound you plan to, but I just want to save you a whole lot of time, money and worry.

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  • Admin

Coming back for more information. It's been a while.


Anyhow, there are two fill holes and two drain holes. The front is for the clutches in the diff and the rear is for the clutches. How often should the clutch pack fluid be replaced and what is the replacement fluid?


Are you asking about a PDK car?

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Hey Loren,


Thanks for the help but this link only discusses one of the two fluids in the front diff. There are two fill holes and two drain holes in the front differential assembly. The front is for the diff and the rear is for the clutch packs. The link is specific to the front half of the diff. But what about the second half?


The replacement fill plugs and drain plugs are sold in two's...

Oil Filler Screw - 900 124 013 01  (sold as a set of two)

Oil Drain Plug - 900 124 014 01 (sold as a set of two)


The PET diagram shows two drains and one fill  hole though. So its more confusing now.


Any thoughts on the second half of the front diff?

Edited by The Beanster
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  • 2 years later...

Bumping this old topic. Im looking to change the front differential and clutch fluid on my 2008 C4.


As far as I understand it: front diff fluid, same as transmission oil (Mobilube PTX, 1.5 L) is changed as the above referenced 996 link.


And diff clutch fluid (aka final drive?) is 000-043-305-40... and is changed from the rear of the car near the transmission? This I am unsure about.

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  • 2 weeks later...
  • 1 year later...
On 11/21/2017 at 1:08 PM, 964hans said:

Forgive my question, but to be sure.  The Mobil goes in the front dif and rear transaxle/transmission and the Porsche goes in the AWD controller, correct?


Thanks for the instructions BTW!

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