the marvel didnt goo up as bad as many other oils can and different thickness changed the tune witch could make it better or worse.usualy a tad better. I ran a imports car shop right out of high school&tech school. those were some fun days as well as head scratching times...I did a lot of mg,alfa,triumph datsun,mazda.and a little of everything elze inported...execpt for vw.I never messed with vw till I got old....18 years ago I got into them for my self. possiably the simplest and most effed up cars ever made.( ****ed up by the morons that think they are working on them.)
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