NGK Spark Plugs - Do not use Anti Seize??
02-04-2022, 02:09 PM
#1
NGK Spark Plugs - Do not use Anti Seize??
Ok, I know the consensus is to use anti seize when replacing spark plugs, but I came across this on NGK's website:
I'm guessing most disagree with this recommendation from NGK? And if I agree that we SHOULD use anti seize, should I torque to a lower value than factory-recommended, to account for the lowered friction with anti seize on the threads?
I'm a little ashamed of my neglect, but I'm preparing to replace spark plugs at 215k for the first time.
She still runs fine, but I'm sure I'm on borrowed time.
1. Anti-seize
NGK spark plugs feature trivalent plating. This silver or chrome-colored finish on the threads is designed to provide corrosion resistance against moisture and chemicals. The coating also acts as a release agent during spark plug removal. NGK spark plugs are installed at the factory dry, without lubrication or anti-seize.
Anti-seize can act as a lubricant, altering torque values up to 20 percent, increasing the risk of spark plug thread breakage and/or metal shell stretch. Thread breakage can sometimes involve removing the cylinder head for repair. Metal shell stretch changes the heat rating of the spark plug and can result in serious engine damage caused by pre-ignition. Do not use anti-seize or lubricant on NGK spark plugs. It is completely unnecessary and can be detrimental.
NGK spark plugs feature trivalent plating. This silver or chrome-colored finish on the threads is designed to provide corrosion resistance against moisture and chemicals. The coating also acts as a release agent during spark plug removal. NGK spark plugs are installed at the factory dry, without lubrication or anti-seize.
Anti-seize can act as a lubricant, altering torque values up to 20 percent, increasing the risk of spark plug thread breakage and/or metal shell stretch. Thread breakage can sometimes involve removing the cylinder head for repair. Metal shell stretch changes the heat rating of the spark plug and can result in serious engine damage caused by pre-ignition. Do not use anti-seize or lubricant on NGK spark plugs. It is completely unnecessary and can be detrimental.
I'm guessing most disagree with this recommendation from NGK? And if I agree that we SHOULD use anti seize, should I torque to a lower value than factory-recommended, to account for the lowered friction with anti seize on the threads?
I'm a little ashamed of my neglect, but I'm preparing to replace spark plugs at 215k for the first time.
She still runs fine, but I'm sure I'm on borrowed time.
02-04-2022, 02:28 PM
#2
Senior Moderator
I've never used anti-seize on plugs
02-05-2022, 12:31 AM
#3
02-05-2022, 09:16 AM
#4
USAF Veteran
While I have yet to change the plugs in my TL, I have always used it on every car I've ever owned (including other alum headed ones) and even in my old Jeep with a cast iron head.
Just don't use too much. Keep the first thread (nearest the tip) complete clean, and don't overtighten the plugs.
Just don't use too much. Keep the first thread (nearest the tip) complete clean, and don't overtighten the plugs.
02-05-2022, 11:46 AM
#5
Three Wheelin'
While I have yet to change the plugs in my TL, I have always used it on every car I've ever owned (including other alum headed ones) and even in my old Jeep with a cast iron head.
Just don't use too much. Keep the first thread (nearest the tip) complete clean, and don't overtighten the plugs.
Just don't use too much. Keep the first thread (nearest the tip) complete clean, and don't overtighten the plugs.
02-05-2022, 08:32 PM
#6
I have always used anti-seize figuring that it couldn't hurt, but I won't use it again. I had an issue with a rear head that developed two small cracks between the spark plug hole and the valves, likely from overtightening the spark plug (Super common problem on some Subarus). I always use a torque wrench, even though it's a cheapo harbor freight one. I won't risk it again, especially since I've never had an issue with removing a spark plug. I know some Ford trucks had a serious problem with spark plugs seizing, but I've never seen it on a J series.
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