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Clatter Clatter

My mechanic used Marv. Mystery Oil as well for '86 GT Coupe. In hotter
climes, my coupe would make a lot of racket. I would actually add a little
Marv. Myst. while the car was running and it would quiet down. Pretty

PS-been told it is NOT advisable to add Marv. Myst to gas tank-though the
label says it's ok. Also, don't add it to the oil if you don't already have