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I have an intermix problem in my 02 Boxster. Car runs fine and no overheating or clear signs of something being wrong, I just happened to look in the coolant tank. Definitely some oil in the coolant and appears to be some condensation when oil cap is removed, but nothing on the dipstick. Anyone know of a good indicator to determine if this is a head gasket or head issue other than a compression test? Wondering if it may be the oil cooler...Thanks.