Having new OEM plugs put in next week in the 2008 HL 3.5V6 AWD.
Has 140K miles on it now, so definitely time to replace.
My question: HL feels fine now, idles smooth - but with that kind of mileage, will I notice a difference with the new plugs? More power? Quieter ride?
Has 140K miles on it now, so definitely time to replace.
My question: HL feels fine now, idles smooth - but with that kind of mileage, will I notice a difference with the new plugs? More power? Quieter ride?