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I have seen one oil pan drain plug be the victim of Oil Can Henry's. When we bought the car, the original owners had been using Oil Can Henry's to change to oil, and not too regularly at that. When I did the first oil change I discovered that Teflon tape was providing just enough material to make the threads sort of catch. The threads would not catch without the Teflon tape. I did re-tap the hole, but the re-tap was not perfectly square with the pan there was a small seep from the drain gasket. When my wife hit the piece of concrete in the street the oil pan buckled through the drain plug. I walked out into the garage and saw this large pool of oil under the car. That is when I changed the oil pan, which is what I should have done to start with (but that would have made it twice!)

After that I removed the lowering springs which came on the car. With her driving the car, it needs all the ground clearance it can get.