Originally Posted by C ///M
Are you sure? The 335i comes rated at 300hp/300tq from the factory, how can it's transmission not be rated for at least it's stock output?
I remember reading that ZF listed that tranny as just meeting the 300tq mark, anything past that was going to be a reliability issue.
And of course, if your pushing your car above the manufactured limits, it is ALWAYS a must to change and check fluids regularly.
You pay to play, can't expect everything to work perfectly.