See attached bulletin by NGK. CLICK
Bosch Spark Plug Specifications CLICK
NGK Spark Plug Technical Info CLICK

 

I read this to mean "Always install new plugs, no removal and cleaning allowed )

 

Pretty sure our OEM plugs have the "Metal shell plating",right? ...... I've always used a light coat of anti-seize over the years in all my cars, being careful to keep away from the tip end, and back off a couple of ft.lbs., being careful not to over tighten. I'm not convinced from this article to change my way. Obviously a couple of Gorillas overtightened their plugs and blamed NGK for it, and they had to come up with this little bulletin. My $.02

 

"Tech Bulletin"? For whom? Authorized Installers?

This sounds more like a sales pitch to me. "Ours are better because..."

I'll continue to use a very light coat (apply and remove 95%) just like I always have.

Thanks, though. I guess I trust myself more than NGK does.

 

Me tooo. always treat threads, no gaulling. Woody

 

I have never used anything on spark plugs, and will probably never start to. I think that information from NGK is spot on and NOT a way of saying their plugs are better, it does not say that only NGK uses plated plugs, and sort of implies that others/most do. The biggest issue with hard to remove plugs is overtightening when installed and failures caused by engine overheating.

 

Yes, NGK plugs have a non-seize coating, but not sure about others. I just replaced the original plugs in my 2004 coupe which were surprisingly NGKs with a Mercedes 3-pointed star imprinted on them. Didn't know MB sourced NGK plugs. I installed some new Bosch Platinums. I used a VERY SMALL AMOUNT of anti-seize carefully applied and rubbed into (and mostly out of) the threads. Have been doing this for years with no problem. However, I didn't do this with the NGKs that I recently put into my Town & Country minivan. From my personal experience, careful use of anit-seize with spark plugs does no harm.