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I got one on my LS7 The PO installed. Done 13K miles (car has 26K)- I have never found any meaningful amount of oil in mine. More of a pain to get it out to empty than it's worth.
Given that, on a stock well-running engine I wouldn't waste my time. Such a small amount I highly doubt it affects octane.
Probably more of a need for higher miles car that burns oil or cars with really sketchy tunes highly susceptible to detonation or under extreme use (boost)
rjp
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