OK, this may be a wild goose chase, but... Back in the 80's some friends up in New England got their cars "hot oiled" every Autumn. They were old cars in good shape, rust-wise, including some known rusters like 70's Datsun's. They would save a few more bucks by keeping their used oil for their mechanic to do it. This was a service most mechanics offered back then. I asked if it all didn't just drip off, no, I was told, it gets sticky and stays put. So, is there a formulation used to get it to stick? Or was this self-delusion, did it all just drip off eventually and add to the water polution? Just found this: http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/2043211/3 Probably not what they were using, but anything more like this?