100plus

Hi guys,

Service is up soon and I was wondering if changing transmission oil is required? My car has done 87000km. Should I be looking to do anything else at this mileage?


Cheers

Sneaky Pete

I need to renew my transmission fluid on the C4. From I can tell here....Swepco 210 or Mobil 1 DT something is the way to go.

Dharn55

Careful on this one. The Mobil 1 synthetic 75w-90 that you will find at Pepboys, autozone, etc. is not the right one. I think the Mobil 75w-90 product referred to as Deltac is the proper one. Hard to find and not cheap. Do a search on this forum and you will find a lot of info on this.

Correction: Sorry it is Delvac, not Deltac

Barn996

Swepco 210 here.

Zookie

not untill 144k

Sneaky Pete

Thanks Doug. Deltac was the word I couldn't come up with.

Phi1720

While I dont disagree that there's a difference between delvac and non delvac Mobil 1 75w-90, what is the difference? Seems a very very easy mistake to make if its no good for your car.

Phi1720

I found this on the mobil 1 FAQ site for gear oil, but the answer seems ambiguous to Porsche specifically. It would appear from Mobil 1's response that the LS 75w-90 is ok.

http://www.mobiloil.com/USA-English/...ransaxles.aspx

On the other hand, I dug deeper into Mobil 1's FQA regarding oil and Porsche and Mobil 1 also recommends the factory 20k oil change interval so maybe take that with a grain of salt.

Thoughts? Not trying to stir confusion or start a drawn out blown up oil discussion. Just genuinely confused.

100plus

I just did a search on the forum and i still do not know what is the best tanny oil for my car ... Is it ok if i just used normal tranny oil? Or is there smth i m missing out. I drive a 2000 C4 TIP.

Macster

Who knows?

I don't know about the 996 NA cars, but I have an approved transmission oil and ATF document for the 911 Turbo (996) and the 911 GT2 (996) for MYs 2001 up to 2005. Oh, the date on the document I have is Nov 5, 2008.

Manual transmissions: G96/50, G96/88.
Tip transmissions: A96/50-150.

I quote the document:

Notice
Use of unapproved ATF or transmission oil.
- Excessive wear and damage to transmission parts.
- Reduced service life.
=> Only use the ATF and transmission oils listed below when topping up or changing ATF or transmission oils.

The Turbo (G96/50 transmission) and GT2 (G96/88 transmission) require Mobil (Mobilube PTX) SAE 75W-90 transmmission oil, part number: 000.043.204.20.

(However, my local dealer's parts department manager tells me I should order all parts and fluids by VIN. Porsche ties parts numbers to VINs and in some cases an old part number has been superseded by a newer part number, so the above part number may no longer be valid.)

I won't post the ATF and transaxle fluids unless some one wants them.

And I expect there exists a similar document for the NA transmissions and front and rear axle drives. (The fluids might be the same but I wouldn't count on it.)

Porsche is under no obligation to assist those that want to go off the reservation regarding vital fluids as to what works and doesn't work or what are the differences between the various brands. The assumption is that you'll rely upon the fluid supplied by the dealer and this is the fluid recommended by Porsche.

I'm not entirely unsympathetic to those that want to seek out comparable fluids from some other source than Porsche. Porsche is one of the dare I say worst (?) companies regarding not extending any more assistance/info to independent service departments. It does only what it has to, by law. Not too many years ago in fact, in the UK Porsche got in some some legal battle with Porsche indy shops seeking access to Porsche proprietary info (mainly regarding DME codes and test/diagnostic steps, and so on) and the argument was that in keeping this info from the UK indy shops Porsche was violating the EU trade agreements.

Sincerely,

Macster.

Phi1720

Couldn't agree with you more Macster regarding Porsche keeping specifics close to their chest. The 20 qt jugs of manual transmission oil that the Porsche dealers recieve has a mostly blank, black label that reads "PORSCHE manual transmission oil 75w-90" in white letters and no fine print or 3rd party info beyond a part number.

jrgordonsenior

The factory Porsche fill is made by Shell and is considered very good quality. Personally I use Lubrication Engineer's Synolec 75-140 but only because I have a Guard LSD with abrasive clutch discs and the factory fill is just too slippery. So I trade off wear on my synchros for a tight LSD....

Dharn55

In reading the Mobil information it seems to say that Mobil Delvac 75w-90 is the correct for non-limited slip transmission, which are the vast majority of the 996 transmissions. The Mobil LS is for limited slip transmissions. So is there anything in the Porsche specs for this difference?

dennis hiip

can buy genuine Porsche gear oil at Partsgeek.com. I was surprised to see it there

Ubermensch

I ran into the same problem when it was time to swap out my transmission fluid. Since the Mobil website was ambiguous I wrote to them to clarify the issue. Long story short, the dealer is the only place to get the approved fluid. For a fluid with a relatively long life I couldn't see any reason to switch and open myself up to possible problems. Go to the dealer and pay the piper.

-Shawn