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Oil in Coolant

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Noticed that my coolant seems to have a black residue in it. Seems to look like (and smell like) oil in the coolant. Would this be caused by a bad head gasket? NOT getting any milky white substance in the oil, which I would think would indicate a bad head gasket.

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probably a headgasket. I have seen stopleak look kind of similar to oil in the coolant though.

Flush it and ride it easily for 15 mins. If its bad you'll know then.

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Checked again after a ride yesterday and it's definitely a black residue in the coolant - looks and smells like oil. Also getting a lot of oil blow by out of the breather hose. Thinking it might be time for a top end.

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