BMW worthless warranty

Since all modern engines have rev limiters, the damage must have been caused by either the timing chain slipping a tooth or changing into a lower gear at a speed higher than its maximum, and letting the clutch up. Fourth to third instead of fifth etc when driving hard, perhaps.
A timing chain slipping would be easy to prove, because it won't go back to normal.
The other is simply driver error. They might argue that a skilled driver should have felt the extra resistance of going down a gear rather than up, and possibly also felt the car slowing up when engaging the clutch and therefore not fully engage it. Or that the driver had simply engaged a lower gear at more than its maximum speed.
*Heart attacks... God's revenge for eating his animal friends

Dave Plowman London SW
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