Quote:
Originally Posted by Weasel
JCL hit it pretty good  And in my non BMW experience from previous shops was that the clutch material in the fluid added some viscosity and changed the friction profile of the fluid, so when people changed all the fluid of an older, higher mileage car the transmission would inevitably start slipping. (I'm sure not being able to reset the trans adaptations with the fluid change didn't help)
I've personally seen more transmission failures on transmissions that have been serviced than one ones left alone. And since I got the vehicle with over 80k miles, I couldn't see any good coming of a fluid change. Now with over 90k miles it still drives perfectly and I'm waiting to see how long it will go before I have to go all swissfrank on her ass. |
So based on all this I have decided to stick with the original fluid in my 4.6is that is about to go past 100K miles.
But what about my wife's car - Mazda Protege. I replaced all the fluid at 60K miles with Mobil 1. Should I just leave that until the trans dies? Or replace every 60K?