CarGuyNVA

Having come from the Cayenne world, I'm well aware of all the transfer case problems with the 958 gen Cayennes. It has proven that more frequent fluid changes (much more frequent than Porsche recommends!) does wonders in keeping the transfer cases 'healthy'.

I'm aware of occasional transfer case problems in the Macan world as well, although they seem to occur less frequently than with the Cayennes (with the 958 Cayenne it's almost of matter of 'when' it will happen, versus 'if' it'll happen).

So for the Macans, are there any recommendations for more frequent TC fluid changes, and if so, what's the intervals folks are recommending? With the Cayennes the recommendation is roughly every other oil change, especially since it's a relatively simple task.

My Macan GTS is nearing 20k miles and I'm considering having it done when it goes to my dealer for the 20k service.

NC TRACKRAT

Here's a link to an extensive thread on the subject. https://www.macanforum.com/forum/eng...-exchange.html 20k intervals may be somewhat excessive but conventional thinking is that 30k-40k would seem prudent.

CarGuyNVA

Great to know, I'll read through that link this evening. Much appreciated

ozziegt

I don't think the dealer will change the fluid? Porsche considers it a sealed unit.

NC TRACKRAT

I don't think that is the case (no pun intended.) Here are the Porsche manual instructions as seen in the above referenced thread: https://www.macanforum.com/forum/eng...xchange-2.html see post #18.

ozziegt

Ok, cool. That's good to know. I was basing my assumption off someone who said the dealer wouldn't replace the fluid but I don't remember where I saw that post. Now that you mention I think he finally did convince the dealer to do it.

CarGuyNVA

Dealers certainly can/will replace transfer case fluid on any of the AWD Porsche models.

Chris M.

My TC was just replaced by the dealer a couple of weeks ago. The service manager confirmed what I had read elsewhere, that the problem they're having is moisture buildup inside because of no ventilation which then causes rust. The updated part is supposed to correct this. It doesn't seem like more frequent fluid changes would hurt anything but they may or may not lengthen the life of an original non-ventilated TC.

worf928

Just got the TC replaced on our 95B-T. 26k miles.

So.... I should change the fluid .... every 30k-miles? Check. Done. New TC thrown in as part of service </sarcasm>

Gonna look at WSM presently. If it doesn’t require PIWIS or if the durametric does it if needed, I’ll just start doing TC fluid with every oil change. <sigh>

Can anyone confirm existence of update parts? The tech that did ours wasn’t aware of any updates.

ozziegt

See this thread: https://www.macanforum.com/forum/com...placement.html
Apparently they added an extension tube to the vent so that it would be harder for moisture get in and also have a revised part number.

NC TRACKRAT

Sorry, I'm a little confused. With only a BS in Industrial Engineering and a PhD in Shade Tree Mechanics, I'm trying to envision how a sealed transfer case full of expensive, exotic lubricant can rust.
Edit: I'll answer my own question. It's not sealed. There's a short, rubber vent tube on the top side of the TC. Apparently, that's where the moisture is getting in. It would seem that a vent with a check valve should be the solution.

PSEE

Doesn't the service schedule for the Macan call for PDK fluid & filter replacement on 40K mile intervals?

NC TRACKRAT

I believe you're correct.

CarGuyNVA

PDK is not the transfer case.

Chris M.

The part number used for my recent TC replacement was 95B-341-010-AX