Re: Change oil only 100hrs? Keep old filter 200hrs?
I asked a friend of mine who manufactured oil filters really how long they last and he said,"at least 15,000 miles",probably longer. Think about how little real sludge or oil contamination comes from a modern ultra lean and clean fuel injected 4 stroke motor. Most oil contamination from older engines/motors came from carbed,choked, rich fuel mixtures that turned the oil black in a big hurry. So most of us, myself included, are changing filters mostly for our own satisfaction and maintenance "overkill". I'm going to keep right on doing it because it makes me feel good and I'm sure that makes the filter guys happy! Good Luck!