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International Automotive Technicians Network
Re: Oil in coolant bottle, best way to pinpoint?
Posted to Technical Discussion Forum on 6/19/2020

I'd try and evaluate how much oil is in the coolant reservoir. If you have 500ml swimming on top of the coolant that is definitely not leftover i from the bad cooler. If you have a slight emulsion on the sides of the degas bottle, it could be residual oil.

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