Use the spark plugs specified by the manufacturer. "Upgrading" to something that appears to be better often leads to running problems. The location of the electrodes, shape and size of the spark, length of time the spark lasts, and voltage required to create the spark can be different. In severe cases that will cause a lack of spark or intermittent loss of spark under certain conditions. When a spark plug needs higher voltage to create a spark, that can delay it until that voltage builds up high enough. That can lead to retarded ignition timing and loss of power and fuel mileage. The specified spark plugs do a perfectly fine job of what they were intended for in your engine. Just because something else costs more doesn't mean it's going to do a better job than the parts already doing that.
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Thursday, May 14th, 2015 AT 6:03 PM