Hi scotty, i have 2003 seat leon and after replacing the coolant, i drove several times and found that the coolant have become mixed with oil and now it is muddy . i checked the head gasket with block tester and it is fine. the engine has an oil cooler and i suspect it is faulty. can the car be driven with oil in the coolant ? thanks.

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it can, but it will ruin the cooling system and the water pump