Hi, there fellow jazzers,what is the life of spark plugs? Ive just had my jazz serviced at 44000 miles at a local garage they renewed the spark plugs I thought they where good up to 70,000 miles.the car gets serviced every year,I think they are the original plugs,I bought the car from this garage in march 2015 with 15,904 on the clock.service this year come to £534.24. I’m glad I got that little rant of my chest.oh the plugs where £32.82p each.