Astra 1.7dti has black oil in coolant header tank. Any thoughts???
Hi, I've owned this astra for 18 months and it's been mainly OK but when I checked the levels last week I saw that the header tank had black engine oil floating in it. Has anyone any thoughts on what could cause this?
Re: Astra 1.7dti has black oil in coolant header tank. Any thoughts???
Oh heck - if you already bypassed it and the oil in the expansion tank is only getting worse then it is sounding like the head gasket. Are there any signs of coolant in your engine oil, emulsion on dipstick and under oil filter cap?