I have no idea what a catch can does. My plugs always looked good when I changed at 50,000 mile intervals. My oil always looked good every 10,000 miles. Maybe I get better mileage with a catch can, maybe spark plugs last to 75,000 miles, which they probably would anyway. I have no clue, and even better, don't care. If I cared I wouldn't be driving a 6,000 pound truck.
10k mile oil changes with active afm?
you sir are brave, or on your 3rd engine lol. year and mileage?