Sounds exactly hoiw my 4.2 QS behaved back in the day when its gearbox gave up.
I can't help with the maintenance, other than giving it all a good clean. Good luck with the repair.
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2019 BMW M5 (my daily driver)
2002 Mark's D2 S8 FE
2020 BMW M340d xDrive (Anely's daily driver)
2000 FL D2 4.2 QS - SOLD 2011
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