When your mechanic puts in a new set of plugs that are "one range colder"...
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...because your car was in for some work and it was convenient for him to change the plugs, it would be good to note that what kind of plugs they are. The NGK BKR7E's were put in nearly 20k miles ago, but I didn't realize that since they were copper they needed changing alot more often than that! Needless to say, I bet new plugs (going in now - back to stock NGK PFR6Q's) helps my car quite a bit, esp. the intermittent misfires, DTC's and CE's I was getting more often lately, and hopefully the knocking under WOT at 5000+ RPM.
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