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These are great performance plugs for your car. I replaced my long life NGK IFR6E11 (Iridium/platinum) with these. The IFRs were supposed to last 80-100k but only lasted about 50k. I was getting cold weather start misfires (below 40 degrees F) but overall the plugs worked great. Since the BRK6EIX -11 Iridium (Iridium/Nickel) is designed for 50-60k and are less expensive, i don't mind changing those out every 4 years. If you want a really high performance power plug that is only rated for 30k miles put in the Denso IK20 Iridium. For my car the BKR6EIX-11 Iridium works great. It is interesting the part # is 3764 and there is also the #4272, both are labeled BRK6EIX-11 Iridium, which I think is an older version for motorcycle application.
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I've had good luck with NGK plugs before. First time using iridium plugs, though. Had them installed a couple weeks now and everything seems good. As far as how long they'll last, time will tell.
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Gotta love plugs you don't need to gap. Buy, anti-seize, install, enjoy the improvement. I've run iridium in Honda gm Toyota and VW. Always trouble free.
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Excellent Quality & Fair Price. Probably the best spark plug manufactured or at least equal to all other quality spark plugs.
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Original spark plugs for my vehicle at an awesome price far more reasonable than the auto parts stores
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