Quote Originally Posted by Main Stream
Does the overflow have any signs of oil in it? Also, does the car have plenty of power or does it feel weak? If the overflow keeps filling up then I would check for a possible blown headgasket and you are pressurizing the cooling system. Do all the spark plugs look the same? Later.
my thoughts exactly, i blew a head gasket on a turbo z6 a few years ago, no oil mixing, but it would pressurize the coolant system and blow coolant out of the resevoir