Eddielee
New Member
I don't know if this question has ever been asked - I just bought this KJ (my first Jeep), '07 Limited. It turned 30K the day I purchased it and the sellling GM dealer supposedly serviced it. They didn't change the spark plugs as called for in the maintanence schedule -- how important is it, with the 3.7 v-6 engine, to change out the plugs every 30,000 miles as called for in both the A and B maintanence schedules? I've read your posts about the kind of plugs to use, but nothing on how often you guys actually change them in a Jeep product.