[beegeezy]

I did the first step of a fluid change in my 535i today. The car has ~92k miles and I think the trans fluid is original.

I drained the fluid out of the fill plug, then drain plug. I then replaced the drain plug and refilled until it trickled out. After reinstalling the fill plug, I warmed the trans to 42 degrees C. Then I topped off the trans and took it for a spin. The shifting is already improved.

Next I will drive the car for a few weeks and repeat the process. Then I'll do a pan/filter change. That should replace a good percentage of the fluid.

I got 11 qts of ZF lifeguard 8 and a ZF pan/filter kit from RM European. I normally like FCP Euro, but this was a much better deal.