Good afternoon, I recently purchased a 1.9 AHU diesel with a blown head gasket. The shop I took the head to, to be resurfaced, has asked me a bunch of questions that i cannot answer. When resurfacing the head, what are the limits, do they make thicker head gaskets for resurfaced heads or do You use a oem head gasket. New to diesel. Any info would be great. Thank you for your time.