Quote:
Originally Posted by Obioban
a) there's no reason to own e30-e9X M3 if you don't rev high
b) the premature bearing failure on the s65 is not correlated to revving high. Seems to be purely lottery based, depending on how your engine did in the tolerance stackup lottery during production. It also does not seem to correlate with mileage, oil used, oil change interval, or driving environment, to preempt other excuses you may next think of that it could not happen to you (seems to be people's natural reaction).
If you're concerned, replace the bearings.
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This
Since the beginning of time, any and all bearings fail in the same way: there is mechanical contact between the crank and the rod instead of crank-oil-rod. Eventually the rod bearing, which holds the oil, gets worn from getting nailing by the rods. That allows the rod and crank to contact directly. Hilarity ensues.
In the specific case of the S65, this happens much sooner than in other cars because it appears the engine was produced with inadequate clearance to let the oil be in there and prevent the rod and crank from introducing themselves.
This, like the E46M vanos issues, is not related to use, there is no way to 'tell', there is no way to 'avoid'. The only thing you can do is replace the inadequately engineered part for a properly engineered one.
In the E46M vanos case, it's either the Beisan solution or the Turbotoy one. In the E9XM case, it's BE Bearings.