You are at the mileage where I'm pretty sure the source of your plastic is your cam chain tensioner wear pads. I've had a couple of M96s apart, one of indeterminate mileage and the other of 106,000 miles and both sets of pads were trashed.
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A cynic is a man who, when he smells flowers, looks around for a coffin.
-H. L. Mencken
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