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Message: <blockquote data-quote="Johnny O" data-source="post: 956912" data-attributes="member: 61743"><p>It works gradually and won't break off chunks of sludge like Seafoam or Marvel Mystery Oil can.  Auto-RX also cleans and conditions seals to keep them from leaking or stop small leaks.  Basically you add it to your oil when you change, run it 2500 miles, change the oil and filter again and run it another 2500 miles.  The second change, or "rinse cycle" they call it, is when the crud REALLY comes out.  That said, if your engine is already pretty clean then it won't make much difference except to condition the seals.  On a clean engine you can just add 4 oz. at every oil change and not a whole bottle and rinse cycle thing.  I've used it on a couple of vehicles.</p></blockquote><p></p>