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Seafoam gets a lot of good press.
I use a tankful or two of Techron before doing an oil change.
In the end one of my friends that rebuilds engines says only a tear-down will really get rid of old carbon deposits.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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