Transmission fluid for 986 5 speed - redline?

[JFP in PA]

Originally Posted by casioqv

If true that makes a lot of sense. Damn, I guess I'm changing the fluid again after all. I will be more skeptical of what I read in 101 projects from now on...

Over the years, Wayne published several "sub optimal" ideas, such as using set screws to secure the IMS shaft while doing a retrofit; not everything was off kilter, but some were real doozies............

[DreamSign]

I just (today) went to my local Porsche dealer and bought 3 liters of the 'special' gear oil. It was $35.74 per liter

The price is so close to everything else, it seemed there was really no benefit to trying anything else.

[jaykay]

I promised to report back on Miller from another for thread I believe. I do find it a bit notchy. I am working with a six speed which is well seems to be inherently notchy anyway I'll go back to the Porsche fluid at some point and report back. Just wondering if there's a difference in formulation for the six speed versus five speed

Miller was put in as a substitute for the Porsche fluid without my knowledge or without my consent

[JFP in PA]

Originally Posted by jaykay

Just wondering if there's a difference in formulation for the six speed versus five speed

Yes, the five-speed oil is unique to that transmission, and only when it is in a Porsche because Porsche used some custom alloy in the synchro rings that were not used in the same gear box in other applications like Audi.

[jaykay]

Okay, is there more freedom with the six speed or is strictly another dedicated oil from Porsche? I think I have come across something pertaining to Mobil Delvac being superior…but may have this muddled

[JFP in PA]

Originally Posted by jaykay

Okay, is there more freedom with the six speed or is strictly another dedicated oil from Porsche? I think I have come across something pertaining to Mobil Delvac being superior…but may have this muddled

Porsche has always set the specs for their manual gear box oil independently of what is available on the street for general usage. Years ago, I contacted Mobil 1, Castrol, and others about suitable aftermarket products and was told that what Porsche uses is unique to them and because they are such a small market, the aftermarket people tend to "drive a square peg into a round hole" with products they already make rather than make one to match. M1 also called the Porsche factory fill products "very high quality full synthetics". They also told me to just buy the factory stuff for either gearbox and get on with life rather than try to make something work. We did and have never had a problem.