Last year I fitted up a bigger oil pan and with new gasket. Been getting a little oil leak when hot, traced it to a couple of the oil pan bolts. No gasket leak at all. I put thread-lock on all the pan bolts, did finger tight, then torqued in sequence from middle out (and double checked!) when I fitted that new pan. I wonder if I removed the offending bolts, and refit now with a copper washer, maybe that will sort things? Any like experiences or advice?