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Which Spark Plug to Buy!?
Hi, I've got a 1991 Jeep Cherokee Sport (4WD - 2 Door) 4.0L I6 Engine (190HP) and i'm wondering which type of spark plugs to buy? The stock spark plug are the Champion RC-12LYC ones, but i'm considering the Bosch Platinum (or maybe even Platinum +4) ones.
Should I buy higher end spark plugs, such as NGK or Bosch or Denso or stick with the Champion brand and get their platinum version??
Thanks in advance! =D
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