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Message: That's a rather extreme position.
Changed By: grant
Change Date: April 19, 2013 08:42PM
Marc, its fairly well documented tThat in old's a rather gearboxes with ageing synchros, soextreme gear lubesposition.
Change Date: April 19, 2013 08:42PM
Marc, its fairly well documented tThat in old's a rather gearboxes with ageing synchros, soextreme gear lubesposition.
provide slightly better results than others. I also have no religious adherence to Porsche branded stuff. Ok, its guaranteed to be good, and its safe -i agree, but its not guaranteed to be the best. Look at their oil recommendations - those are clearly inferior, driven by CAFE.
At minimum iplan to buy the Audi fluid which is identical. It must be, Audi made the 5-sp box in the first place, not porsche.
The friction modifier makeup can be significant.
I also don't recall even asking about fluid, but someone offered a strong opinion. So i'm asking for rationale.
I have no religious adherence to Porsche branded stuff. Ok, its guaranteed to be good, and its safe -i agree, but its not guaranteed to be the best. Look at their oil recommendations - those are clearly inferior, driven by CAFE.
At minimum i plan to buy the Audi fluid which is identical. It must be, Audi made the 5-sp box in the first place, not porsche.
The friction modifier makeup can be significant. We know that people looking to improve the performance of aging synchros often use a different fluid with different cocktail of friction modifiers. One one of my cars i'm very much in that boat.
I also don't recall even asking about fluid, but someone offered a strong opinion. So i'm asking for rationale. Seems fair. I might learn - or not.
Let's be real. Porsche brake f;uid - ate super 200. Porsche PS fluid = pentosin CH11. Porsche auto tranny fluid = Esso Lt7441.
If you were being serious, then, no, you cannot choose any one you want. It really must be GL-4 since the synchros are brass. Since i will be tracking the car, ultimately nearly exclusively, i'm also most concerned with hgih temp stability and low wear, not with slick shifting nor low temp performance.
Finally, note that the OEMs are also thinning out their tranny fluids. While they cant yet mess with 75w90 (or it would not be so), they are lowering the Cst values for auto transmission fluid - again in the name of fuel economy. This is not good for high temp wear one little bit.
Grant
At minimum iplan to buy the Audi fluid which is identical. It must be, Audi made the 5-sp box in the first place, not porsche.
The friction modifier makeup can be significant.
I also don't recall even asking about fluid, but someone offered a strong opinion. So i'm asking for rationale.
I have no religious adherence to Porsche branded stuff. Ok, its guaranteed to be good, and its safe -i agree, but its not guaranteed to be the best. Look at their oil recommendations - those are clearly inferior, driven by CAFE.
At minimum i plan to buy the Audi fluid which is identical. It must be, Audi made the 5-sp box in the first place, not porsche.
The friction modifier makeup can be significant. We know that people looking to improve the performance of aging synchros often use a different fluid with different cocktail of friction modifiers. One one of my cars i'm very much in that boat.
I also don't recall even asking about fluid, but someone offered a strong opinion. So i'm asking for rationale. Seems fair. I might learn - or not.
Let's be real. Porsche brake f;uid - ate super 200. Porsche PS fluid = pentosin CH11. Porsche auto tranny fluid = Esso Lt7441.
If you were being serious, then, no, you cannot choose any one you want. It really must be GL-4 since the synchros are brass. Since i will be tracking the car, ultimately nearly exclusively, i'm also most concerned with hgih temp stability and low wear, not with slick shifting nor low temp performance.
Finally, note that the OEMs are also thinning out their tranny fluids. While they cant yet mess with 75w90 (or it would not be so), they are lowering the Cst values for auto transmission fluid - again in the name of fuel economy. This is not good for high temp wear one little bit.
Grant
Original Message
Author: grantDate: April 19, 2013 08:40PM
Marc, its fairly well documented that in older gearboxes with ageing synchros, some gear lubes
provide slightly better results than others. I also have no religious adherence to Porsche branded stuff. Ok, its guaranteed to be good, and its safe -i agree, but its not guaranteed to be the best. Look at their oil recommendations - those are clearly inferior, driven by CAFE.
At minimum iplan to buy the Audi fluid which is identical. It must be, Audi made the 5-sp box in the first place, not porsche.
The friction modifier makeup can be significant.
I also don't recall even asking about fluid, but someone offered a strong opinion. So i'm asking for rationale.
Let's be real. Porsche brake f;uid - ate super 200. Porsche PS fluid = pentosin CH11. Porsche auto tranny fluid = Esso Lt7441.
If you were being serious, then, no, you cannot choose any one you want. It really must be GL-4 since the synchros are brass. Since i will be tracking the car, ultimately nearly exclusively, i'm also most concerned with hgih temp stability and low wear, not with slick shifting nor low temp performance.
Finally, note that the OEMs are also thinning out their tranny fluids. While they cant yet mess with 75w90 (or it would not be so), they are lowering the Cst values for auto transmission fluid - again in the name of fuel economy. This is not good for high temp wear one little bit.
Grant
At minimum iplan to buy the Audi fluid which is identical. It must be, Audi made the 5-sp box in the first place, not porsche.
The friction modifier makeup can be significant.
I also don't recall even asking about fluid, but someone offered a strong opinion. So i'm asking for rationale.
Let's be real. Porsche brake f;uid - ate super 200. Porsche PS fluid = pentosin CH11. Porsche auto tranny fluid = Esso Lt7441.
If you were being serious, then, no, you cannot choose any one you want. It really must be GL-4 since the synchros are brass. Since i will be tracking the car, ultimately nearly exclusively, i'm also most concerned with hgih temp stability and low wear, not with slick shifting nor low temp performance.
Finally, note that the OEMs are also thinning out their tranny fluids. While they cant yet mess with 75w90 (or it would not be so), they are lowering the Cst values for auto transmission fluid - again in the name of fuel economy. This is not good for high temp wear one little bit.
Grant