Quote:
Originally Posted by Petah78
My theory is that this can be a sudden or a gradual death, and in the event of a gradual problem, UOA will pick it up.
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That's a bit like saying the answer is Yes or No.
That's exactly the point of UOA. That's why Blackstone Labs has been around for almost 4 decades. Incredibly popular in the BMW crowd who have cars with S motors known for eating rod bearings.
Engines like the S54 in the E46 M3 are notorious for this. Some speculation is that bearings are too narrow to carry the HP and RPM load of the engine, since it has the same bore spacing as the old M20. A 6k 170hp engine, not an 8400rpm 333hp engine.
Some of the pro's think the reason is guys beating on the cars before the oil is fully up to temp.
Quote:
Originally Posted by Tcoat
Agree there is a lack of info on other bearings since most find the one and "OK there is the problem we are done here" but there have been enough saying just the one that I am comfortable in making the statement.
If there was even one oil analysis that said "we have concerns" I may also change my outlook but there just isn't.
Failure mode and risk analysis of industrial processes are what I have done for 30 years and I will say that with what we have I am about 75% confident that these failures are sudden. I would be happy to change that level (up or down) with a nice big data set but I don't think we are going to get much more info than we already have. Really the only new data I expect is if the mileages go up and there are still multiple failures but at this point they seem to have stopped. Or at least no longer get reported!
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I'm more curious about build dates, so far it seems most of the ones reported have been 11-12/21 build dates.