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Originally Posted by kplusten
My 99 JGC hit 100K miles so decided to change spark plugs, thinking they were platinum. Was amazed that they were copper core and lasted that long. Two dealers said to go with platinum, my dealer said Jeep does not recommend them. Found an article that said the platinums are incompatible with the setup with a coil per plug and can confuse the computer due to potential reverse polarity. I want long life but don't want to screw up the vehicle! What's the real skinny?
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In the same boat as I am curently doing a tune up and looking for spark plug recomendations myself. I am a GM mastertech so this is nothing new only problem is I am not up to date on DODGE and the old school rule of thumb was always to put Champion plugs in Dodge vehicles only as they will foul out in EVERYTHING else. I have learned to hate champion plugs over the last 25 years and am not looking forward to putting the god awfull junk plugs in my 98 Grand cherokee. which is why I'm researching my options. Generally platinum plugs are for long life and high mileage applications the coppers work perfectly well but unlike the platinums they wear out more quckly. the upside is you can tell when they are worn simply by looking at them. platinum plugs can look brand new at the tips when pulled out of vehicles with 120,000 miles on them. I haven't pulled the original plugs out of mine yet but if they are not platinum then I will most likely replace them with a NGK spark plug as I have never had a problem with those plugs in over 30 years and they are superior to most performance plugs as well as dirt cheap. Best of Luck