Not a fan of oil additives. Remember Slick 50 or even farther back to STP and Motor Honey? All gimmicks that were at best a very temporary band aid to quiet a loose engine long enough to make it somebody elses problem. Reason why I dip a finger to feel and smell every fluid on a used piece of equipment. These are NOT anything like synthetic oil. Switching to synthetic is never a bad idea but don't expect it to repair worn bearings or rings.
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