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I had the analysis just for my own curiosity, not really intending to justify or modify my oil change intervals. I change the oil once a year whether it's needed or not.
That said, I've never had engine problems from any vehicle I've owned. They're built too good these days to give any problems even for those who miss the recommended change interval.
Anyhow, throwing an oil changing party this weekend. Probably do 5 or so vehicles.
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