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Message: <blockquote data-quote="PinkieT" data-source="post: 1504281" data-attributes="member: 20959"><p>Almost all conventional motor oil has detergents, only exception are some lawn motor oils because some of the older air cooled motors required non-detergent oil or some really cheap crap I see at the dollar stores.  Switching from Pennzoil or any brand name conventional to a synthetic shouldn't cause any problems at all.  High mileage oils (both conventional and synthetic) contain special antioxidants, detergents, and additives that can help reduce engine wear and minimize the chances of sludge buildup. High mileage oil also helps prevent aging seals and gaskets from becoming brittle and causing leaks.  High mileage oils are suggested for motors with 75,000 miles or more.</p></blockquote><p></p>