Spark Plug recommendation

I’m looking at replacing my spark plugs and was thinking on Denso Iridium…are they worth the cost or should I stick with the regular factory plugs for 1/3 of the cost?
I’ve only had the plugs changed once and I currently have 130,000 miles on the truck.

 

Denso copper.

 

Stock.

 

Which is 3 Denso and 3 NGK lol

 

Denso copper plugs, K20HR-U11 (OEM Part #

$7 90919-01235 Toyota Genuine Spark Plug

90919-01235). Iridiums have created problems for some people. Not sure why.... but stick with copper.

 

3 Denso and 3 NGK…is that still recommended? I wonder why the mix of the two.

 

Stock. Some will say that platinum-sparkle-unicorn plugs help MPG and HP but they're talking out their rears.

 

The iridium proponents don’t typically say that, they say the plugs last longer than copper.

 

Just pick one or the other. Denso is the more popular choice. Stick to copper. Rumor has it that Toyota had an agreement/contract with both Denso and NGK so used 3 of each. Another theory is that one side of the engine requires a meniscal amount of less resistance. They are all just theories. At the end of the day, we may never know and it doesn't really matter.

 

Copper plugs are at a different heat level than Iridiums. Folks who swap out the coppers for iridiums have mixed results. The copper Denso plugs are super cheap, just use those.

 

OEM

 

According to Wikipedia

"After becoming independent from Toyota Motor, the company was founded as Nippon Denso Co. Ltd. in 1949. About 25% of the company is owned by Toyota. Despite being a part of the Toyota Group of companies, as of the year ending March 2016, sales to the Toyota Group accounted for less than 50% of total revenue (44% of revenue originated from other car manufacturers in Japan, Germany, the U.S. and China)"

 

I replaced my 2008's with Iridiums and had no problems, the only benefit is longer replacement intervals

 

Exactly. Meant to say “last longer”.

 

I think they are all the same heat range

I did a part search on the NGK site for my 2015 truck and all the plugs suggested were heat range 6

$10 LFR6C-11 V-Power Spark Plug, Pack of 1

LFR6C-11 V-Power Spark Plug Heat Range 6

FR6AIX-11 Iridium IX Spark Plug Heat Range 6

LFR6AHX-S Ruthenium HX Plug Heat Range 6

I replaced the plugs on my 2015 with Rutheniums a week ago, I couldn't find Iridiums.

 

There’s been some conversation on TW in the past on this, and the experienced folks said that all the plugs are copper-based primarily, the iridiums just have a coating at the electrode. So that would explain the same heat ranges all around.

 

Iridium is only referring to the central electrode. They can last 100,000 miles. Copper you'll be changing more often. Go with what you can afford. Denso or NGK, they're both about the same. I tend to use NGK's since they are properly gapped out the box & I've been using them for decades.

 

You are right, the cores are all copper, the tips are different metals


Iridium


V-Power

 

I've used NGK Iridium X with my 2008 and this time I installed NGK Rutheniums, I only use NGK and maybe Bosch if I can't get NGK.