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New NGK Plugs - Anti-seize or no anti-seize?

35595 Views 25 Replies 15 Participants Last post by  CJKaz
I've done 25 plug replacements in my life. In the old-days, I'd put a dab of oil on the threads. Fast-forward to my Hondas, I was a regular user of anti-seize on NGK threads until I stumbled on this paper from NGK. NGK says Not to use anti-seize on the nickel-plated plugs. I had been using it up until a couple months without issue.

What are your thoughts?
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DO NOT use anti-seize on NGK spark plugs! I just did mine last month.

Don't believe me?

Call NGK Tech support at (877) 473-6767

I did.....

EDIT: Just read ypsibird's excellent link....discussion on what Honda says vs. what NGK says, with a mix of torque wrench vs. hand tighten to sweeten the plot.

Tech bulletin from OP's post:

Surprisingly, neither website says anything about have to search for a tech bulletin to find that link above.
I still put a small amount on the threads, Honda Service Manual says so, and I back off the torque just a bit when tightening.
Do most V6 guys periodically pull their number 5 spark plug? Should they use anti-seize?
Do most V6 guys periodically pull their number 5 spark plug?
My guess would be no. I'm aware that a few members have found #5 to be loose but I don't think I would pull mine out to check whether it's loose. I checked my wife's 03, but about all I did was put a socket on it to feel whether it seemed loose. Since it didn't seem loose I left it alone. If it's not broke don't fix it. (a favorite adage, probably since I'm lazy :))
my opinion is to continue using anti-sieze and if you aren't sure about how tight to tighten a plug look up the torque spec and purchase a torque wrench. those plugs in those pics look like the tech used a 1/2 impact to zip em down. that's ridiculous...hehe
If you are using New spark Plugs I would do what the marker of the plugs say to do.. They might have a idea what you should do with their product.
For 40 years I've put a dab of copper-lead anti-seize on every plug of every cylinder of every engine I've ever owned or serviced. Any decent "wrench" has a feel of torquing home spark plugs without stripping and breaking things.

Also, I think NGK's Technical Bulletin is pretty much baloney with its chromate break away lubricant. If it's broken away, it's clogged the treads in the cylinder. And what about reusing a broken away plug.
My plug #5 loosened WITHOUT anti-seize when it was the original set from the factory. Anti-seize isn't the reason for #5 backing out.

Read the owner's manual, it says to use anti-seize and I have done so for the last 15 years on 2 Accords. Use just a small dab not a big load of it.
Quoting Keystone in the linked thread on this site above:

"The reason you need anti-seize is that the steel of the plugs forms a chemical reaction with the aluminum of the cylinder head and the two dissimilar materials bond together."

This is why you use anti-seize.
Honda says YES to use anti-seize.

NGK says DO NOT use anti-seize for two reasons:

1) Over-Tighten or Over-Torque:
"Applying anti-seize to the threads of spark plugs that have a metal plating allows the installer to mistakenly over-tighten the spark plug in the cylinder head; This stretches and fatigues the threads of the spark plugs, causing a much higher probability that the plug will break during installation or in some cases upon removal."

2) NGK's are already "anti-seized" ready:
"For spark plugs with special metal plating simply do not use anti-seize on initial Installation; All NGK Spark Plugs are manufactured with a special trivalent Zinc-chromate shell plating that is designed to prevent both corrosion and seizure to the cylinder head; Thus eliminating the need for any thread compounds or lubricants."


So the questions are:

A) If you are using a torque wrench, will you still over-torque them? I'm guessing "NO" have a torque wrench!

B) Does anti-seize lubricant alter the torque readings in anyway?

C) Even though the plugs already have a plating on them, is that a "one-time" use (so if you remove your plugs and want to put them back in- is that "plating" now gone and therefore you NEED anti-seize?)

D) Does adding anti-seize damage that special NGK plating? In other words, is NGK saying the use of anti-seize is "unnecessary", or simply "un-wise"?:paranoid:

I guess what I am leading to here is that if I use a torque wrench and 50 cents worth of anti-seize, am I gonna be OK?
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The main reason I see why not to use anti seize is to prevent damaging the threads from over-torquing...What percent does the anti-seize truly throw off the torque reading? 5%? 10%? I would think the safety factor on the published torque numbers has to be at least 2 to account for weakening of the aluminum or factory/dealer installation variances, so unless the anti-seize throws the torque reading off by more than 50% I would rather use it and know I'm safe...
I'm sure I made my opinion clear in the previous thread that Honda's recommendation should be followed.
It was also noted in the previous thread that the recommendation is the same for the 8th gen also. In other words Honda has been recommending anti-seize for 10 years now. I would think that if it was causing the type of problems that NGK indicates that Honda would have issued a Service Bulletin or ServiceNews by now! If they have, I've never heard about it. Maybe Princess could check on that?
Further, have there been significant reports of problems related to using the anti-seize on Honda NGK's? Again, I'm not aware of them.
I wonder whether Acura has a similar recommendation? Maybe some of the members that frequent the Acura forums or have an Acura service manual could enlighten us?

I guess what I am leading to here is that if I use a torque wrench and 50 cents worth of anti-seize, am I gonna be OK?
Unless there is some new and compelling information, I'm afraid this is one of those things that there is no 100% answer to. All you can do is read and analyze the available info and make your best determination.
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I wonder whether Acura has a similar recommendation? Maybe some of the members that frequent the Acura forums or have an Acura service manual could enlighten us?
Honda, Acura, same thing.
For what it's worth. I always use anti-seize on my plugs (NGK) and I don't use a torque wrench - which could be the reason for applying too much torque when using something that initially acts like a lubricant. 100K or >, is a loooooong time. Of course the torque wrench in my brain has been in use a long time and has never failed me. Someone installing plugs for the first time might think twice.
Honda, Acura, same thing.
Thanks for clarifying that. So did you confirm in your Acura service manual that NGK's are specified w/anti-seize and the same torque settings? Or did you read similar threads in the Acura forums? Thinking it's the same and knowing it's the same are different.
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