Posts: 1936
Location: Eau Claire, WI | Scott,
I've used it for years. Every other tank in the boat (according to local Merc. mechnic only in carburated and EFI's, not suppose to use in Opti's) and I put it in once a month in the truck. Chev. Vortec V8 5.7L/350cu.in.
Back when I used to run dirt track cars we used it every week to help keep the top end of the motor clean. Works great for top end lubrication and cleaning.
Not sure about using it in 4 stroke outboards and was told it's not suppose to be used in direct inject motors, i.e. HPDI, Opti, Ficht.
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