Quote:
Originally Posted by Hope
A BMW Service Manager also told me that the gearbox oil can and probably should be changed but only if the car is expected to go on for 1,000,000s of miles.
I also read that the method that BMW use to change the oil and the method that gearbox specialists use differs in that BMW don't completely flush through the new oil but simply drain and top up. (Something like that!) Also remember seeing a figure of 11 litres, I think this was the figure needed for a complete flush through?
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The BMW service manager needs his bumps feeling IMO. You can drain drop the sump nad change the fluid as stated in my previous poist above.
He's right re the quantity of fluid, you won't be able to drain the torque converter, you'll drain from the gearbox around 6.5 litres(providing it doesn't leak-when we drain its not unusual to drain barely 5 litres worst one we've had barely contained 3.6 litres of fluid) You won't get all the fluid out from memory its around 11.8 litres inc. Torque Converter but when changing the sump and re filling you'll get around 6.5 litres back in.
You can if you really want to stand a change of getting the best out of the change re visit the sump drain and re fill again after around 500 miles of motoring that way you might get a bit more of the older fluid in the conveter mixed up and drained, but its not really guaranteed that this method would be 100% sucessful, better do the sump nad fluid change run for say 4050k then repeat the exercise