I'm at 100 hours on my Vanguard and I see in the manual it calls for changing the spark plugs at 100 hours. Seems awfully soon to be changing plugs, but my last mower was a diesel so I’m not entirely up on gas engine mowers. Anyway, my manual lists two different plugs, Resistor 491055 and Long Life Platinum 5066. Any idea which one of these plugs I should use? Or any other plugs I should use instead?
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