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Re: Compression Renew Oil?
Additives are generally not required unless you have specific problems with your vehicle.
Octane booster is usually required only for non- EFI high compression vehicles that ping with premium, when everything is tuned properly.
Old muscle cars (1960's) and highly modified engines with carburetors can benefit from octane booster, thats about it.
As for oil additives, the 'renew' stuff can temporarily help severely worn engines with lots of blowby past the rings. But such engines actually need a rebuild.
Most other oil additives are completely unnessary for engines in good working condition.
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