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hey bud,the cover needs to come off to get those back plugs,heres what the say...
When the spark plug has a single or double platinum tip, the recommended service life for normal driving conditions per schedule A in this manual is 100,000 miles (161 000 km). The spark plugs have a recommended service life of 75,000 miles (121 000 km) for severe driving conditions per schedule B in this manual. A thin platinum pad is welded to both or just the center electrode end(s) as shown in.moe
25 or so years exp.with chrysler,plymouth,dodge.jeep."A"tech at dodge /jeep dealership.living in N.J. "LET ME KNOW MOE!!