I just want to start, this is a great forum with lots of smart users, much props. I have 89 honda civic si. Car is stock except for lowering springs. I have about 220k on a stock d16a6. I resently notice gunk (oil?) build up in my coolant reservoir tank and under radiator cap. Ok so, head gasket is probably busted. Right ? Head could also be warped, cracked, I so hope not thou ( car was not over heated). I was thinking of pulling the head and changing the head gasket over the weekend. Ok my question is are gaskets from auto parts store ok to use other than OEM? price wize they are 1/3 the price than OEM. I just heard OEM is best etc. etc. 2nd question. To clean up all the gunk I heard that its possible to use Shout ( laundry detergent ) instead of coolant for like 30 min (running) and then flush it. It cleans up cooling system so oil dont mess up the hoses. And also is it mandatory to resurface it?