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DIY Transfer Case Fluid exchange

124K views 178 replies 42 participants last post by  drawz  
#1 ·
Have not seen this listed here so thought we might get it rolling.
Seems a lot of TC failures across different P models.
Reading other forums exchanging this fluid is not a bad idea, and relatively easy ?

Dealer says this fluid Is good for 240K km, or 16 years.
On full drain takes 3 Litres of said fluid.
Sunset has this transmission fluid for $67/L
My dealer wants $500 CDN for a full exchange.

So all we need is the plug ( back ordered a month at dealer) and fluid.....and procedure.

Anyone else done this? Seems a good thing to to do if you may be out warranty......


2016 Macan Turbo
 
#33 ·
**** I wish I lived closer to you, awesome work man.
Would you estimate the drained TC fluid at 200- 300 ml? Would you assume you lost the difference to 500ml from a leak ? Or just never filled properly, or wear ?
How much was you able to load in the TC Roop.

Great work !! Cant wait to hear the drive report !
 
#34 ·
So it looks like the leak was from the pdk if you see the seal in my last post. So the fluid loss in the tc I would amount to just being burned off from heat or wear maybe? Or maybe there was a small leak at the tc as well, hard to tell but I’ll measure what came out and what goes in today when I complete the oil change.
 
#35 ·
Vent kit installed for the diff and the tc, also attached a pic of the pdk vent - it’s way up close the the engine up high in the trans tunnel so I did not feel the need to move that vent. Cardan shaft is back in, Just need to pop the exhaust back on, fill the oils and done!
 

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#37 · (Edited)
All done transfer case fluid exchange. Measured what came out and was 500ml I have in that container plus about 80ml. So about .58l came out and same went in.
 

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#39 ·
Yea there is a shark bite quick disconnect for the vent hose so I just pulled the vent hose out and put the hose for the filler in. Will be doing test drive today, will let you know how it goes.
Awesome job ! Did you fill it through the newly created vent line ? and not the fill port ? Or am I seeing things /forum/images/MacanForum/smilies/tango_face_smile.png
How is the drive Roop ?
 
#40 ·
So I drove it to work today and everything seems to shift much smoother and quicker, car idle’s smoother as well. Launch control launches are less violent during the gear changes. Totally worth the effort! Transfer case fluid was defiantly burnt. And gear oil looked pretty black but diff fluid looked ok. Not sure which fluid made it all run smoother but glad it does!
 
#42 ·
Haha, looks like a fun "run in"
I am definitely changing the TC oil next oil change. When you get a chance man, can you list the Porsche p/n's for parts and tools needed for non gear heads :) Was the drain plug magnetic ?

That will wrap up your excellent DIY.
A mechanic will do mine though, lol.
 
#43 ·
Sure, I’ll do that this weekend.
Haha, looks like a fun "run in"
I am definitely changing the TC oil next oil change. When you get a chance man, can you list the Porsche p/n's for parts and tools needed for non gear heads /forum/images/MacanForum/smilies/tango_face_smile.png Was the drain plug magnetic ?

That will wrap up your excellent DIY.
A mechanic will do mine though, lol.
 
#46 ·
Plugs are not reusable - they have a sealant on them. I used the Porsche fluid, I would not use any third party it could ruin the tcase. I will post all part numbers tonight.
 

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#48 ·
Got all the parts from https://www.sonnenporscheoemparts.com
2 x 955 301 115 01 - Screw Plug Transfer - $14 each
000 043 305 63 - Transfer Case oil replaces origional spec (000 043 301 36) - $41

Tools:
Motive products powerfill pro fluid transfer pump
Motive products power extractor (this would have been needed in order to get all the oil out if I did not pull the transfer case out)
Hex bit sockets
Drain pan

As far as the oil, looks like Porsche has updated the oil to the part number I list that replaces the origional spec oil so I am not sure if ravenol would be compatible with the new fluid? The cayenne transfer case is a totally different beast. But I just went with the Porsche oil to be safe.
 
#49 ·
Drain/Extract or just Drain?

How important is it to perform the extraction step versus just draining ~500ml and adding that amount back in?



In my case, I would like to add "transfer case fluid refresh" to every other engine oil change or so. If I skip the extraction step, the procedure is that much easier and swift (and I avoid needing to purchase a power extractor). I would just drain, refill equivalent amount (until it drips), replace the two case plugs; done.



2015 Macan Turbo w/ ~19k miles
 
#50 ·
If you changing that often I would think it would be fine. That is what I’ll prob do next time I do it prob next year.
How important is it to perform the extraction step versus just draining ~500ml and adding that amount back in?



In my case, I would like to add "transfer case fluid refresh" to every other engine oil change or so. If I skip the extraction step, the procedure is that much easier and swift (and I avoid needing to purchase a power extractor). I would just drain, refill equivalent amount (until it drips), replace the two case plugs; done.



2015 Macan Turbo w/ ~19k miles
 
#51 ·
Draining and refilling the same amount (~500ml) should work, unless the factory fill amount was not correct.

I used this method on my Lexus because it has a transmission fluid dipstick for checking fluid level. On my BMW I used OP’s method since it doesn’t have a dipstick for checking transmission fluid level.
 
#52 ·
Did you do the Oil changes?
I'm a little confused on the tranny, transfer case and differential fluids on my 2015 Macan S.

I did the clutch fluid and little canister filter. I was very nervous, but it is pretty straight forward. I used OEM fluid: Pentosin FFL4

Is there a tranny filter and fluid change in addition to the "clutch" fluid?
If so. Do you know which are the correct fluids for :
Transmission, Transfer case, and Differentials (Front and Rear same fluid?).
Thanks,
Ron
 
#53 ·
Am curious as to why filling is through the vent tube with the fill/inspection plug out. Why not just fill via the fill/inspection hole? Or am I missing the obvious?
 
#56 · (Edited)
This is an awesome thread. Just finished reading all the comments.
I have my 2015 Macan S at the dealership ship at the moment, having the TC replaced.
Will defenetly install the breather extension as soon as I get it back, and will follow up with bi yearly oil change.
Thanks for the great info ttmacan
 
#58 ·
Has anybody had small issues with the TC (basically it shifts into gear but has a small lag before it goes into next gear, small lurching feeling from accelerating at a stop) @ 61k? Bought the car used and was thinking i could replace the TC fluid to see if that changes anything. Im not sure if the 60k mile service was done but i was going to tackle the TC fluid change myself, but i also heard the PDK fluid and clutch fluid should be changed at 60k miles?

Sorry for hijacking the thread but i came across the TC fluid change and figured the symptoms im having might be related to having the TC fluid changed.

Cheers
 
#64 ·
Yea but gravity drain will not extract all the oil as the drain is not directly at the bottom, and there is not that much oil in there, but you can def give it a try. Yea pretty hard to top load with much of anything other than a hose. You could try attaching a hose to a jug and squeeze but I do a lot of my own work so the motive power fill was a pretty cheap tool considering it contains the oil and will not make a mess everywhere.
 
#66 ·
In addition to the Motive, there are hand-held pumps/extractors like the MityVac (with the proper attachments) which would suck out the remaining fluid and, in turn, you can use it to pump in the new.
 
#67 ·
Performed the transfer case oil change today. Big thank you to the contributors of this thread ?.

Here are some of notes from the procedure:

1) I only need to jack the front up to perform the change. I used the supplied Porsche car jack to lift one side at a time and placed jack stands at the additional jack points hidden behind the small access panels. I also placed a small metal plate between the stand and the jack point to even out the pressure across the surface. The plate dimensions were roughly 2.5"×2.5"×0.25".

2) I only got around 300mL drained by removing the drain plug. I then extracted an additional ~200mL from the vent port using a small tube (actually a fuel line from a chainsaw) attached to a 50mL syringe.

I purchased this guy (ABN Automotive Fluid Transfer... https://www.amazon.com/dp/B075NKV4CR?ref=ppx_pop_mob_ap_share) to use for the extraction and refill but the supplied tubing was too big. So I did everything with the small 50mL syringe.

3) As the directions suggest I refilled through the vent instead of the inspection hole even though it would have been much easier to use the inspection hole. FYI, I put in 580mL even though I could not remove quite that much.

BTW, I was very impressed by the build quality I found under the Macan. Lots of aluminum, heat shielding, and very little rust after 32k miles. I wonder if an X5 or a GLE looks quite as impressive ?