Mopar muscle cars left the factory with Champions. I know Chrysler got there hands in alot of pie but I don't remember them making lawn mowers. My Toro had a champion plug in it when new also. Put autolites in a Ford and AC Delco plugs in a chevy where they belong. Tried and tested Champion allways comes out on top in head to head tests with other brand spark plugs. When I get a minute I will look up a couple old mags that tested spark plugs and post them.