6 PCS NEW -- DENSO # 5358 IRIDIUM Power Spark Plugs -- IK20L

Car Bmw X5 runs smoothly after self turn up. Parts (Iridium spark plug, ignition wire, cabin filter, air filter, oil filter, and synthetic oil ) cost $200. Garage may charge no less than $600.

No complaints

Exactly what I was expecting

Been two weeks since install. I replaced using these plugs and Denso wires in my 2011 Jeep Liberty Jet. Gas mileage went from 17 mpg to 23 mpg. It starts and drives beautifully now! No more hesitation or shaking. I had already switched out the ignition coils last year due to a check engine light. Wish I would have swapped out the plugs and wires then. Could have saved tons of engine wear and gas money!

These Denso Iridium Power #5358 (IK20L) are a very good upgrade option.For my Jeep Liberty with the V6 3.7L engine, the factory installed spark plugs were the NGK <R> plugs, which are actually the copper ZFR6F-11GUpgraded years ago with the Denso Iridium Power 5304 (IK20) which were made in Japan.Over 60K miles later, as I had to do some more extensive engine maintenance work I decided to replace them all. Selected a set of 6 (six) of the 5358 (IK20L, where L stands for elongated protrusion of the electrodes into the burning chamber). On the boxes it states that they are "Made in USA with foreign components"; don't get fooled by that, it is more likely "packaged in the USA" as these spark plugs don't have the three green stripes on the outside porcelain like the original japanese spark plugs.Made the purchase in early April 2022, installed them in early May 2022 and in early August 2022 started to have issues with Check Engine light code P0306 (Misfire at cylinder # 6) which is the cylinder that is the hardest to reach and to work onto: passenger side, against the firewall.As I had brand new spark plugs, I decided to replace the ignition coil (with a Denso 673-5300) but the above code P0306 kept coming back after a short while.In late August 2022, as the misfiring got worse, I decided to do a more serious job: drained the coolant, removed a lot of other stuff out of the way (air filter box and intake tube, coolant expansion tank, etc) and removed all the coils and the fuel rail with the fuel injectors to do a thorough fuel system cleaning; I did have some special fuel system cleaner, very reach in additives and cleaning detergents.Used the opportunity and removed and inspected all the new spark plugs. To my surprise, found that in less than 1,000 miles the spark plug at cylinder #6 developed 2 (two) cracks in the ceramic surrounding the central electrode and causing the spark to jump and misfire -- see the pictures.People, be aware that this is the answer that I got from Denso Products and Service Americas, quote:"All warranties are at the place of purchase, in your case Amazon, which is not a DENSO authorized distributor! DENSO has a warranty ONLY to our DENSO authorized distributors (one year and unlimited mileage).Looks like you are better off to make your purchase from a auto parts store nearby.

Primero tuve mis dudas, ahora estoy facinado con el producto, mayor desarrollo en el motor y buen desempeño en altura 5mil metros sobre nivel del mar. Clima extremo

Rapidez

Good factory replacement.

excellent plugs, these are the OEM made in Japan plugs.

Quality spark plugs and priced wayy below auto parts store prices.

Work great. Proper fit

No problems they work great!

In additiona its roughness in the engine of my Acura MDX , it is a very poor quality that does not represent the name of the product.