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or coolant level increased due to the addition of oil from an unknown source - cracked block, cracked head, bad head gasket, failed oil cooler. coolant tank then overflows. check coolant tank for intermix (milkshake) and dipstick for coolant in oil. check oil level - going down? then probably going into coolant somehow. don't go buying oil coolers and o-rings until you check a few things.
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