I've got a 2003 Mazda MPV that's seeping a little at the oil pan. I've tightened the pan bolts, but it doesn't seem to have done much. I'd like to avoid changing the pan gasket. I was wondering whether a stop-leak might work, or something else that might swell the gasket a little. I was thinking maybe an OCI of Maxlife, but I also have a jug of LC20 on hand and have seem many different products at the auto parts store. Any ideas? Thanks!