911BOSS

I would really like to change the gear oil in my 2011 C4's front differential, but needs some help. I found the previous post with photos that show the drain plug and where the fill plug is, but when I took the cover off the bottom I discovered two sets of drain/fill plugs? There is one drain/fill pair on the front differential where the axles attach, but there is a second pair a little further back where the drive line enters.

The entire unit seems to be one casting, but I was not sure if there are two sets of drain/fill plugs in order to get all the fluid out and filled properly or if there are two independent housings and they require different fluids?

Thanks!

Pors968

Is it okay to use Mobilube PTX 75W90 fluid in front differential on a 4S? Like to get confirmation before I replace it.

TIA.

JayRace

There are 2 different fluids used. One for the differential and one for the AWD controller in that assembly.
For the differential side use 75w-90 gear oil and for the AWD controller use ONLY Porsche
part #00004330300 which is a 75w-80 fluid. Do not put anything else in the AWD controller no matter what anyone tries to tell you. Only the Porsche labeled fluid.