True story. My dad changed the oil on his Toyota Tercel. On the post change test drive, the oil light came on. His thinking: "I just changed the oil, there can't possibly be any problem with the oil". Low and behold, he didn't get the oil filter seated, and the engine puked all the oil out. And while he figured it was just a light malfunction, the engine was destroyed.
Dad had the engine rebuilt, and shortly thereafter, the car was donated to my younger brother, just entering college.
My bro is a thrasher when it comes to mechanical things. A couple of years passed, and I started bugging him about maintaining the Toyota. Eventually he conceded, and I directed him on what to do to perform an oil change. Come time to change the filter, and it was stuck fast. Strap wrench crushed the can, but it wouldn't loosen. That's when he called on me for help.
A screwdriver though the can just tore the can open. Grabbing the filter stem with pliers, cheesed it off. Last resort, a chisel on the periphery of what was left. Victory!
An examination of the remnants of the filter showed that dad used RTV on the filter seal. His thinking: "It couldn't possibly have been MY FAULT, when the filter puked out the oil, it MUST have been a faulty seal"...thus the RTV.
Dad was not shy about getting his hands dirty. God bless him. He did all kinds of home improvements, that as far as I know, were successful. An auto mechanic, however, he was not.
And the Tercel made it through several years thereafter.
The end.