Spark Plug Anti-Seize Compound

I am using a tiny amount of a product called Silver Goop. Then torque to spec. Normally used for spark plugs in GE aircraft engines. Never ever had a problem.

 

Hi Dan,
I have the silver for aluminum and copper anti seize. I can give you some of both.

 

No problem...glad to help.
I will be back in town tomorrow. Give me a call.

 

So let me muddy the water some; or is that clear up miss information. NGK says torque is dry and derate 30% if you use anti-seize. There is more info but a short read. You can find their recommendations at this link:
https://www.ngk.com/learning-center/article/522/plug-torque-settings

 

Some time ago, a few years, there was a long discussion about the impact of anti-seize on torque spec. As I recall the result, and many of the pros chimed in at that time, is that the impact is 30-35%. That was based on a bunch of different sources that had done tests. NGK also has a number of turns spec if there isn't a torque wrench available. You could use that because it is independent of measured torque. But, you are 100% sure you will over torque if you use anti-seize and torque to spec. Does it damage things on any given time? Who knows. It depends if you exceed the elastic limit of the metals.

 

Torque always must be reduced if a dry spec. Not for nothing, I've never used anti-seize on a spark plug. I don't think the idea is bad, just never had an issues without it.

 

Just put some engine oil on the threads, using anti seize is ok until you remove the plugs and the stuff drops off into the liner. Copper anti seize is copper dust in a grease , it dries out and the copper dust is left between the threads, when you remove the plug it breaks and falls off.
One place not to use is on very fine threads as I have seen this lock a blanking plug in place, that it had to be drilled out.
It was used extensively in high pressure boilers on the hand hold doors and worked fine on course threads.

 

http://www.jagrepair.com/images/AutoRepairPhotos/NGK_TB-0630111antisieze.pdf

 

https://www.ngk.com/learning-center/article/522/plug-torque-settings

Something there, not shared in the other ngk page, about heat extraction rates through the plug not being what they should when mis-torqued.....another reason not to over or under-torque....to do your best to get it near spec.