My 08 Ram got new plugs a 55K--I used the factory plugs from dealership--I hate Champions but hey..everyone says go with OEM so I did. Truck ran great before, same after and now has 98K. Factory says every 30K or so if I remember--Get yor mind right, get every little length extension even the 1 in one and take your time--#5 and #7 were extra fun. All in all not as bad as I thought.