listen to the engine on startup.. is it shaking around? is it hard to start?
also, unplug the hose coming from the valve cover and see how much air/smoke is coming from it... this indicates the amount of "blow-by" which is caused by worn out piston rings... the more smoke/air the more worn-out...
my engine has a pretty good amount and its got 260k
also if its a m46 4 speed manual w/ overdrive be sure the OD works properly...
thats all I can say since I dont know much on the subject.
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