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If the oil is turning grey, it could be a blown head gasket, or busted water jacket. If it's fuel in the oil, it depends on what kind of fuel system. Fuel injected systems can have leaking manifold gaskets and leaking injectors. Systems with carburetors can have stuck floats causing fuel to mix with oil. Water doesn't hurt as bad as antifreeze, which can damage bearings. Fuel in oil thins the oil lowering its viscosity and causing more wear.

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13y ago

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