I’ve heard a lot about people using Marvel Mystery Oil with their engine oil (about 20% MMO to 80% engine oil) to break down carbon deposits and flush out the engine. Is this a good or bad idea? Could it hurt the engine? Can you please explain why if it is a bad idea? Thanks!

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ScottyKilmer
ScottyKilmer

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it is a great oil, just be sure to change the engine oil after doing it