Denso long life HD Iridium spark plugs are super good spark plugs, they "Rock"! Cost a little more up front, but worth every penny.
I have installed them in every spark infested engine I own except my old Farmall Tractor. V8s down to chain saws!
They actually even have them for small engines like lawn mowers, chain saws, pressure washers, portable generator engines, etc...
Basically, install them and forget them for a very long time.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve