ZFR6FIX11 IRIDIUM PLG 4B | Replaces MZ602069 1UNH-18-110 BY481-ZFR6F 999-06910-X9-020 4701 5357 5358 IK16L IK20L IK16TT 9603 9604 9664 FR7KII33X.

These are the plugs I run in most of my automotive applications. I've never received a bad one. With BMW engines, they'll go 50-100,000 miles, easy. From a nit-picky standpoint, none of the NGK IX plugs I've run have ever had any kind of an issue. No dished-out crush washers, broken electrodes or anodes. I use anti-seize (some people will tell you to do this with NGK, some will tell you to avoid it) and torque to 25-27 foot-pounds; I've never had one back out or come loose, or stripped threads or otherwise hurt the block. These install easily with a standard magnetic spark plug socket. I don't see improved power or economy or any of that typical mumbo jumbo. What these plugs give you is the knowledge that you'll only have to replace them every 50,000-100,000 miles. Compared to copper or platinum, the extra couple bucks you pay per plug will pay itself back not only in the longer lifetime but in the labor you save by not having to replace them so frequently.

Check the resistance to be sure they are authentic. It should be between 4 and 5.5 ohms. Check the gap, it shouldn't be off more than 1 degree +/-. Watch videos on how to see the difference between real and fake. These work flawlessly in my 2.2 Honda. The gap is spot on. Been two years now...seem like new.

The spark plug came out with about 80/90k on engine where ngk iridium *Japan*engraved .I randomly go Denso power iridium it said assembly USA with foreign parts so I switch back NGK iridium and buy on Amazon the plug said only NGK so I buy different web site they also say NGK only so I'm good to go with this NGK iridium spark plugs car feels like new engine with new Denso ignition coil wich also original coil for 2001 honda civic.

Installed it for my 2000 Honda CRV. Car started right away. 2000 Honda CRV as far as I read has heat range 7, this NGK 6441 ZFR6FIX-11 is R6 (range 6), means hotter. Good for engine start, maybe not too good for mileage. Before this spark plug model I had NGK ZFR6F with the same R6 heat range. So I can't tell if will it be any change in gas mileage. Previous one worked for 9 years and still did, regardless that needle gap increased on 0.5mm in time. Car would still start but couple times it did on second attempt. My point is I can trust NGK. This one has pointy needle tip. Will it evaporate faster? I don't know, will see. In addition, I can tell that it feels like the car became more responsive to gas pedal. Before I had to step on it harder to start moving. Now it responses to slight push.

NGK plugs have never let me down, always consistent

What can i say great spark plugs. I installed them in a 2007 dodge ram worked like a champ was delivered on time!

Best price online or local for NGK Iridium plugs. I wrecked my truck before I could install them and was given a full refund promptly. Great price, product, and customer service. 10/10

The plugs were perfectly gapped out of the box..040. Fit and work as expected.

Good but all of them needed to be re-gapped. Checked on multiple gauges and calipers. all 4 of them were too closely gapped. Description said it was pre-gapped .044" more like .036"

conforme vraies bougies NGK. pour ceux qui se posent la question, il existe des contrefacons NGK; celles ci ne le sont pas, elles sont arrivés rapidement, parfait état. Sur honda accord 2.0i es 147cv année 1999, zfr6fix-11 parfait, meilleur ralenti, plus doux, plus réactive, je sens une petite différence. Le gap est juste en dessous de 1.1mm, ce qui est recommandé pour ce modèle de véhicule et ces bougies: donc pas eu à retoucher quoique ce soit. n'hésitez pas, ce vendeur est sérieux, les bougies sont de qualité. je partage cela pour les prochains qui passent après moi, ca peut aider. cordialement

Excelente! Mejoró mucho el rendimiento de Civic.

Goede prijs.

Excelente producto, muy recomendable