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I think using non-syn. oil would do more neg. that pos. even if u do change it more frequently. Just as it does damage to an engine such as the e90 if you use 87 octane instead of 93 octane. Plus its much cheaper! 15,000mi.=$80-$100 or 3,000mi.=$25-$30. Thats $125-$150 for regular oil changes, which makes synthetic oil changes much better.
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