Today I met someone that is driving a 1937 Chevy 4door sedan. It's been in his family since his grandfather purchased it new. During WWII the grandfather changed the stock bypass filter for a homemade filter because spares became impossible to find. His homemade filter used a roll of paper towels in a canister as a prefilter and a roll of toilet paper as a final filter. Every 2000 miles he changed the paper towel prefilter and changed the toilet paper filter when it showed enough stuff on the top of the roll, usually every 5-6 thousand miles. The oil was drained from the sump only once a year and refilled with straight 30w engine oil. The head gasket failed during WWII and the grandfather made a new one out of 3003H14 aluminum purchased in a scrap sale at his employer, Consolidate Aircraft, and that gasket is there today. He also put a coolant filter on the system. Anyhow there have been several ring and valve jobs since 1937 but nothing has been done to the bottom end of the engine except several repairs on crankshaft seals. At just over 70 years old and an estimated half a million miles this car is doing well. It's a daily or weekly driver. I drove the car and it felt like going back in time. Apparently bypass filters do a good job of extending the life of engine oil at its peak when is then good for the engine.