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

I'm thinking about getting some new plugs for my jeep too, i'm also wondering which ones to buy. Anybody have some suggestions?

As long as they're in the same heat range, brands shouldn't really matter. I use the original equip Champs (or equivalents). Since my XJ is just transportation, I keep everything relatively stock and spend the extra money on something else.

Just make sure you set the gap properly and be careful installing them.

bosch is what i use in my 87 jeep xj

Bosch Platnuim is what I use in my 00 XJ w/ 84,000 on it. Also if your looking for a little more POWER!! I would recommend a K&N FIK, with a Magna Flow muffler. The intior noise is a little more, but bearable.