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Lubeman once said that the additives don't separate out. If I was using oil that had been on my shelf for many year, I might shake the bottle. I don't use old oil however.
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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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