Denso SK20HR11 Iridium Spark Single Review

Original Equipment Spark Plug, but I recommend anyone buying these spark plugs to check the 'gap'. My 2010 Toyota Tundra 5.7L requires an adjustment of .44, but these plugs were adjusted to around .30-.35.

Direct replacement for spark plugs in my 2010 Toyota Tundra 5.7L V8. Easy DIY job with this adjustable socket: GearWrench 80546 5/8" x 6" Swivel Plug Head Arrived well packaged and duty paid. Forks from Revain and an hour or so, saving you over $100 making it yourself.

I changed the spark plugs for the first time at 123,000km as a preventative maintenance measure as my FJ was running fine. I can't say my truck runs any better, but definitely no worse, so I'd say it's at least the perfect replacement for OEM spark plugs. NOTE: The OEM spark plugs I pulled out were also DENSO, just not Iridium. I expect long-life iridium candles to last even longer, but we'll see. This is my third TOYOTA (Celica, Tacoma and now FJ) so I know I can't go wrong with TOYOTA…

It is true that the product picture says "Made in Japan", but the candles I received were assembled in the USA with parts imported from Japan. Yes, they should update the picture. But I'm glad I got them in the spirit of local vocals. It not only has precision parts from Japan, it is also precisely assembled in America, which is a win-win situation. The best part is that it fits my 2007 4Runner V6 SR5 4WD. They come with copper plugs, so I had trouble convincing the overlords at the dealership…

Great replacement spark plugs for my 2008 Toyota 4Runner. Delivered as promised, satisfied except for one major problem. The delivery was of poor quality. Each spark plug came in its own little box, all six of which I ordered were simply placed on cardboard and then wrapped in that cardboard. The pair was partially out of the box at the time of delivery. The flash point cover was left in place. I was concerned about the porcelain part which I checked without noticing any issues. I'm careful…

The DENSO Iridium 3421 spark plug featured in the ad has clear 'DENSO' and 'Japan' stamps on the base ring to match the DENSO genuine part. However, the forks I received are stamped 'Assembled in USA with Parts from Japan and USA' on the base ring, not as advertised. The word "DENSO" on the white insulator is shaded and appears lighter on the original DENSO part as shown in the promotional photo. However, the spark plugs I received have "DENSO" written in solid dark print which does not match…