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Originally Posted by DanielGr
I haven't looked at this - but does the M235i use a dual-mass flywheel? If so, did at any point BMW test run-out and play in the flywheel?
In my previous Renault Sport Megane (you guys don't get in US) - I had similiar issues I would say to what you describe but perhaps a bit worse. I would get issues with shifting into 1st and 2nd, especially on warmer days.
In that case - it turned out the dual-mass flywheel had failed which was causing the clutch to not disengage fully, so when you were in 1st with the clutch pedal fully in, you were still rolling forward a couple of km/h.
The failed DMF caused both the flywheel and pressure plates to have burn marks on them from slippage.
FWIW that gearbox was manufactured by Getrag, which I believe BMW also uses for its manual gearboxes?
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Getrag box for 228i and ZF box for M235i (same box as 1M).