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Ha- as far as automotive engines and cylinder wear... I have a Tempo 2.3 with almost 300,000 miles on it with good compression on all four. I've had the cyl head off a '94 Taurus 3.0 with 150,000 miles and not only was there no ridge on top, the crosshatching was clearly visible.
So I'm thinking cyl wear is an issue that's already under control.
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