The Best Miles 125/day
Brother of The Benz, 300EE320
Your wifes car will probable outlast the other type that is only driven to the market and back.
I would guess that you don't experience extensive crankcase contamination is because the engine is run long enough to vaporize those solvents that form in the motor oil.
They say that the real bad item is sulphor combined with water condensed in the cold engine.
I see nothing wrong with spinning on a new filter and using the motor oil in the crankcase considerring the driving that is being done.
Keep it up.
Happy Trails Beep Beep from The Spiderman in Houston!!!
P.S. Join the group of wierdos