So finally I got my second manual transmission replaced at another dealer hassle-free. As I suspected: when a synchro first starts grinding the transmission is basically on borrowed time until it no longer shifts into the affected gear. I was told I have to take it easy for about 1000km but after that "I can drive hard because that's what BMW M cars are designed for". Not based on my experience, they aren't, I am not rolling dice on replacing another transmission/clutch/flywheel any more.
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