[Steeveedee]

They are also more efficient, and as much fun to clean as an oil bath filter. If it were my guess, Chevrolet did away with that design because of the nuisance of changing that o-ring every time. If you don't change the o-ring, things can go very wrong. I learned that at the age of 15 when I changed the oil in my eldest sister's '57 Plymouth, and left the old ring in because I thought it would be OK. I know that I didn't like that style, and I've done hundreds of oil changes since then.