Review on NGK DILKAR6A 11 Laser Iridium Spark by Chris Russell

Same spark plugs as my 2010 Altima. All four replaced at 85,000 miles for preventive maintenance and I got a rough idle. I replaced each of the new candles with the old ones one at a time, and it turned out that one of the new candles was bad. The gap was good (0.043; probably a bad contact inside the case or something). Anyway, Revane is as good as her; The defective one was sent back and a new working one delivered free of charge a few days later. So I can't rave about the product, but since I got a broken plug: -1 star. I'm sure most other users will get a 5 star experience.