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I changed my transaxle fluid in September of 2021 because when I bought the vehicle (in August 2021) it had a leaky drive shaft seal. Bought the seal, fluid and crush washers from Porsche. The fluid Porsche gave me was pumped into a 4 liter jug from a bulk jug and I was told it was part # ATF-043-305-48. This correlates to Fuchs Titan Sintopoid 75W90 GL-5. Is this what Porsche is now using for the Aisin transaxle? Why does the Porsche part number have the "ATF" prefix? It is a 6-speed.
From what I can see online, this is the correct fluid, but the problem is it doesn't shift near as good as when I bought the car. Seems better when warm, but when cold it's very hard to get it into 1st at a stoplight and 1-2 shifts are very bulky. The shop that did the work said they put in 2.7 litres. Perhaps its a bit under filled?
Thinking of changing it to Motul 300gear which is GL-4/GL-5. Anyone tried this in the Aisin tranny?
Last edited by OntarioTurbo; 02-07-2022 at 05:16 PM.
What year is your car? What fluid is spec'd in your owner's manual?
Mine manual denotes PTX.. a few dealers I am aware do NOT use PTX and typically fill with Delvac... these few were completely unaware of PTX even though it is specifically spec'd. I exchanged emails with one Rennlister who challenged his dealer and pulled out his owner's manual and the dealer got angry. Plenty of threads about PTX, just Google it or read my original here: https://rennlist.com/forums/997-foru...-gear-oil.html
Thanks for replying. The car is a 2005 base Carrera 3.6. Owner's manual gives no spec for fluid, only capacity. It tells me to take it to a Porsche dealer. I have checked online and the correct fluid part # is what the dealer apparently gave me, although in an unmarked jug, (ATF-043-305-48). This is made by Fuchs. No idea why the prefix says "ATF", but I know it doesn't shift as good as it did before.
I have searched, but no one seems to talk about the Aisin transaxles specifically. Apparently the PTX is not used in the Aisin transaxles Porsche started using in 2005.
Not that it should matter, but it is a Canadian car. Looking for some guidance on what I should use.
Last edited by OntarioTurbo; 02-07-2022 at 05:15 PM.
Hi Bruce, I checked in my owners manual and I can't find any info on transaxle oil except for capacity. I know you may have a different manual with your car being a 997.2, but what page did you find that on?
I think I'm going to order some PTX from Renn Part. Closer to me here in Canada and they decant it into 1 liter bottles. My car is sleeping in storage right now so won't be able to change it until sometime in April, but I'm looking forward to no 1st gear jam and smoother shifting.
Hi Bruce, I checked in my owners manual and I can't find any info on transaxle oil except for capacity. I know you may have a different manual with your car being a 997.2, but what page did you find that on?
I think I'm going to order some PTX from Renn Part. Closer to me here in Canada and they decant it into 1 liter bottles. My car is sleeping in storage right now so won't be able to change it until sometime in April, but I'm looking forward to no 1st gear jam and smoother shifting.
I picked up an 18L pail of PTX from a petroleum vendor in Markham last year for around $250.00 and split it with a few Rennlisters here ....Want the address ?
Fresh fluid definitely aids in shifting and "notchyness" but don't expect miracles as the Aisin transmissions by nature of their design and tolerances within are notchy ...and even more so when cold.
I can't count how may sport bikes I had over the years where the transmissions behaved exactly like my 911's ...so much so I don't even notice it any more ?? I just make the necessary corrections when encountered without thinking and carry on ..
Last edited by rileyracing1; 02-07-2022 at 10:58 PM.
Rileyracing1: Just went to order the PTX from Renn Parts and with shipping it works out to $93 CAD per liter. $278 CAD total. For that amount I could get a 20L jug and make some money back by selling some to other Renn listers. So,if it wouldn't be too much trouble please send me the address in Markham if you don't mind. I will probably be visiting my son in T.O. in the next month or so anyway.
997.1C2S: So by your chart, if I'm reading it right, it looks as if Motul Gear 300 viscosity is actually a little less that PTX at 40 deg C. Not that viscosity numbers alone make up a good oil. The two are very close in almost every way, but no way to know the friction modifiers etc in each. I can get 3 liters of that for around $100 CAD shipped. I wish I had more info from people that have actually tried it.
That chart is missing another very important aspect of this oil. The GL rating. GL rating denotes for differentials or manual transmissions. Ours is a transaxle hence the PTX formulation of GL 4.5. This GL rating is printed as a spec of the oil required by Porsche per my manual. There are very very few oils with this GL spec.
Google around about GL rating. There is more to oil than just a few specs. You can think this through until you are blue in the brain, but if you are having issues as many of us do with these manuals, then why not try what is spec'd in your manual (at least for .2 cars)? Others like me have found this spec reduces some of the ills many of us experience.
Peace
Bruce in Philly (now Atlanta)
Last edited by Bruce In Philly; 02-08-2022 at 03:57 PM.
I agree with you. On the Motul site, Motul 300 Gear is rated as a GL4/GL5 oil. Not sure if that means it's the same as a 4.5 though. Like you said, there's a lot more than just specs in the oils. I'm sure the PTX is the ultimate with Motul being a close 2nd. I'll see if I can buy a larger quantity of the PTX here in Canada and sell some to fellow Rennlisters.
Last edited by OntarioTurbo; 02-08-2022 at 04:00 PM.
Funny stuff. So far Bruce (displaced to Atlanta) is our chief tribologist on this thread. He will be proud and he is right. The answer is simple-- PTX. The tribology I understand, the part I don't get is why it is difficult to get it in Canada. Dealers sell it in the labelled 1 L bottles and so does Pelican and others . They advertise simple and cost efective shipping for orders under $200 C. I have no knowledge on this subject.
But the answer to the real question PTX. Buy 3 bottles, no more. Don't spill it.
02-07-2022, 10:15 AM
Not Another Gear Oil Question!
