oil pan gasket

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Spend the money on a loose valve adjustment and check the snug of the gasket yourself. The tend to look like there's a leak because of the drippy mess below the oil filter.

I have no signs of leakage on my concrete drive either. Nor does it use any, or lose any oil. Thus far anyway

so what are you worried about? just snug it up a little [not too much] and tell them you'll wait until it leaks more. and use an oil like castrol - it has decent seal conditioners in it, and that works for gaskets too.