Do DENSO iridium long life spark plugs require Anti Seize on thread?

https://ngksparkplugs.com/en/resources/5-things-you-should-know-about-spark-plugs
Says silver or chrome color plugs don't need anti seize on line 1. With that said I still put a little on .

 

Dang the spark plugs, I want the Dodge Dart in his signature

 

yep

a little goes a long way !

 

Thanks for that link.... I knew I had seen it before, but lost track of where. Bookmarked for future reference. Right or wrong, I also use a small amount.

 

You don’t need anti-seize on your Denso spark plugs.

 

https://agradetools.com/best-spark-plugs-for-toyota-2tr-fe-2-7l-engine/

 

One update to that article is that the North American Toyota part number that supersedes 90919-01191 is 90919-A1002.

Jeff

 

Lol.Yea still wish I had it .440 six pack

 

looks like Toyota was getting complaints about the fake 90919-01191

$57 SK20HR11 ---- IRIDIUM PLATINUM power pack Spark Plugs -- # 3421 ----- 6 PCS NEW

SK20HR11 iridiums and changed up the part number and supplier as a counter measure to ensure that people are getting the OEM plugs, I bought the original SK20HR-A11 long life DENSO(blue box) from Rockauto after getting a set of what looks to be fake 90919-01191 from an EBAY seller which I never installed after finding out about all these fake DENSO and NGK plugs the ones I got from ebay seem to be genuine fakes. all this to use anti seize or not to use anti seize has my head spinning I always used it on my 3.4l and did 30k plug changes no issues, now I got the 2.7l four which has a 120k mile interval but both manufactorers say no anti seize necessary and if you do use it reduce the torque 20%, that means instead of 13ft/lbs. make it 10.5 ft/lbs using anti seize too confusing, I think im going with the manufactorers recommendation and not use it, seems like the only time to use it is when you pull the old plugs to inspect them it pulls off the factory coating so a little anti seize should be used for reinstallation of the old plugs.

 

To use or not to use...what's a girl to do???

 

90919-A1002 is an

$57 SK20HR11 ---- IRIDIUM PLATINUM power pack Spark Plugs -- # 3421 ----- 6 PCS NEW

SK20HR11 supplied by Denso USA to Toyota (Made in USA)
90919-01191 is an SK20HR11 supplied by Denso Japan to Toyota (Made in Japan)

90919-A1002 has been in use in Toyota vehicles since 2009. Both part numbers are still available and being used. The only difference is which one the parts distribution network is using in whatever country to happen to be ordering them in. Toyota's North American parts network simply decided to start using the US-made plugs for service supply in Canada/USA.

To help spot fakes, here is a picture of both current packages:

 

Using them on plugs with factory trivalent coating doesn't hurt anything, as long as you reduce the torque by 20-30% if using a torque wrench. The half-turn method is completely indifferent to friction & torque variation.

 

great info I never knew the A1002's even existed, my fake ones box looks exactly like the lighter colored red box on the left, ive decided not to use(anti seize) since its the manufactorers rec.

 

I use nickel anti-seize, it typically has the highest temperature rating, and I do use it on spark plug threads- despite spark plug manufacturer's saying not to. Either Ford or GM, or maybe both, say not to use it because it impedes heat transfer from the plug to the head and can lead to detonation/pinging. I've not had that issue so I continue to use it sparingly. What I have seen on multiple vehicles is that with 50-100k mile plug changes, they do not always like to easily unscrew if you put the plugs in bare, like the factory does- they get corroded and are very difficult to remove.
I've done the math, and if you use the nickel anti-seize on threads, you reduce the torque by 15%. This assumes 36% of the friction is in the threads.

$36 Never-Seez NSBT-8N Silver Pure Nickel Special Anti-Seize Compound, -297 Degree F Lower Temperature Rating to 2400 Degree F Upper Temperature Rating, 8 fl. oz. Brush Top Can

https://smile.amazon.com/Never-Seez...ords=never+seize+nickel&qid=1576592265&sr=8-1

 

Having to do a thread repair insert on spark plug holes isn’t all that difficult. KD tools makes a nice kit everything needed included.

Having to stop with a simple replace the spark plugs job to go looking for a kit sucks. They come as a spring like insert or a tube like insert. The tube creates a better stronger repair. I recall someone trying to chase the damaged threads with a tap, broke the tap off in the plug hole, on the phone screaming at the snapon guy.

All that frustration could be avoided with a simple 3 second swipe of some anti seize.

 

I apply anti seize on every spark plug vehicle I own. And then I torque to Manufacture OEM specifications. No over or under tightening worries. It doesn't take a lot of anti seize on the threads for it to work, trust me. Glob it on the size of a golf ball, PROBLEMS I bet. I use Loctite Products on all my vehicles including touring Harley Davidsons. Never had an issue. And I won't when I put new plugs in my Taco in 7,000 miles using anti seize on them. Sometimes we sure over think the little things here........ including myself at times. But not using anti seize on a spark plug and tightened to factory spec torque is not one of them to me. Do what you see as correct though since I'm just a parts changer....

$19 Loctite 37230 Thread Treatment Sticks, 20 g, Silver

https://www.amazon.com/Loctite-37230-Silver-Anti-Seize-Stick/dp/B003THFRCC/ref=sr_1_7?gclid=CjwKCAiA__HvBRACEiwAbViuU9pdxB4uXJwU6AtzZUecA8MoPwGyQnwHGRASntxBqoOFn6hokGl8OhoCYnUQAvD_BwE&hvadid=177557734695&hvdev=c&hvlocphy=9015054&hvnetw=g&hvpos=1t1&hvqmt=b&hvrand=7560748537211639569&hvtargid=aud-835997443427%3Akwd-36939741400&hydadcr=6426_9585704&keywords=loctite+silver+grade+anti-seize&qid=1576841346&sr=8-7

 

My vote goes for no.

Something about it not allowing to correctly torque to spec the plugs.

Then again I don't torque spec anything other than engine internals.

 

Just a pea sized dab of it on the lower threads. Any change in torque spec will be less than the percent error in my cheapo wrenches. So 13 ft lbs and they're good to go.

 

this is what I was doing on my 3.4l engine apply a very thin coat anti seize and then factory torque spec which was 15 ft/pds on that engine never had a problem those were the DENSO copper core dual electrode plugs every 30k miles, I never really knew that the plug makers didn't rec using anti seize at that time

 

word on the street is to lower the torque spec 20% when using the anti seize where this comes from and how I don't know that would make the new torque at 10.5 ft/pds I wonder if anyone has ever had any issues removing the original plugs that I assume didn't have and anti seize applied to them from the factory, my plugs are the originals and im closing in on the 120k mile interval to change them out 2.7l engine