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Originally Posted by Efthreeoh
Humm... S54 anyone?
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S54 doesn't really have a rod bearing problem like S65 and S85. It did when it was launched before the recall, yes. I've seen S54s over 150k with original rod bearings. Does it wear them a little faster than a garden variety engine? Yes. Should you consider replacing them above 125k or something? Probably, depending on how it was driven.
S65 and S85 are far worse. Pretty much every engine is on borrowed time by 100k, and some never made it to 100k. Followed the threads for years and never seen a bearing pulled from one at high mileage that wasn't in horrific shape. It's not just the rod bearings, but also the main bearings in rare cases.