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Message: <blockquote data-quote="donald73d" data-source="post: 47278" data-attributes="member: 6074"><p>I think Amsoil is excellent oil. Maybe the best available. So are their filters. If an engine is dirty (sludge, etc) it will clean the engine slowly, which is what you want. I would not (read that as NOT) use any engine cleaner or flush in your engine as there is too much chance of freeing up large chunks of crud that might clog an oil galley. Let the synthetic oil clean it slowly. The only exception is a cleaner called Auto-Rx and with it you have to do a "clean" cycle followed by a "rinse" cycle. I have used it as have many others. You have to order it and follow the directions. Another member who replied said he did not notice that synthetic oils got dirtier faster than dino, thus cleaning out the engine. You would really need to pull the valve cover, find sludge, then do a few oil changes using synthetic, then pull the valve cover again to see what it then looked like. Its very possible the engine was not sludged up when the synthetic oil was added, thus it will just keep it clean. The real forum to ask oil related questions is BITOG Bob Is The Oil Guy. They know their stuff. Pablo over there is an expert on Amsoil and a sponsor.</p></blockquote><p></p>