When I used to turn wrenches for money in the 70-early 80's a woman had one she called Betsey in a 60's Dart. The rear seal was blown out and for years she did not want to fix it. There were a ton of times she brought it in for gas and when we checked the oil it was almost always 3-4 qts low. It finally got hit and totaled with around 150k on it. She gave it for the shop to use for parts and we pulled the engine and the pan had sludge molded in the pan with and you can see where the crank turned in it. Told myself the motor was bulletproof!