Why not install the plugs yourself? I mean I get not everyone has time or knowledge to do so, just curious as to the why.Fiance gave the independent shop owner 6 NGK iridium spark plugs to install last August. I'll post pictures of the spark plugs tomorrow upon returning from the dealership. The iridium plugs were purchased from Napa and apparently were never installed in fiance's Jeep. The Jeep was running well again at the dealership this afternoon after new plugs were installed. Don't have it back yet since there wasn't enough time today to reinstall the valve covers after they inspected the valves.