NGK’s position on anti-seize
NGK spark plugs are manufactured with a trivalent plating. The spark plugs display a silver or chrome finish on the threads. The trivalent plating reduces corrosion resistance from moisture and chemicals. The trivalent coating also acts as a release agent during spark plug removal. NGK spark plugs should be installed DRY, WITHOUT anti-seize.
NGK reports that tech support personnel have received a number of calls from installers who have over-tightened spark plugs because of the use of anti-seize. Anti-seize is a lubricant and affects torque values by up to 20 percent. If you use anti-seize against NGK recommendations, you MUST decrease the set torque on your torque wrench by that amount or risk breaking the spark plug, distorting the shell, or damaging cylinder head spark plug threads.
Autolite’s position on anti-seize
Autolite does NOT recommend the use any type of anti seize lubricant when installing new Autolite spark plugs. Since anti-seize compounds contain metallic, electrically conductive ingredients, the ingredients can come in contact with the electrodes on the spark plugs, leading to misfires. Anti seize lubricants also introduce a torque multiplying effect, leading to cylinder head spark plug thread distortion, galling and cylinder head damage.
Autolite applies a nickel plating to the threads of new spark plugs that resists corrosion and seizing.
AC/Delco’s position on anti-seize
AC spark plugs should be installed dry. Do NOT use any type of anti-seize lubricant on spark plug threads. Anti-seize lubricants decrease the amount of friction between the threads, resulting in over tightening. That can cause the spark plug to move too far into the combustion chamber (in crush washer applications). Over-tightening can also distort the spark plug shell, causing a leak which would allow blowby to pass through the gasket seal between the shell and insulator. Over-tightening also results in extremely difficult removal.
Champion spark plug position on anti-seize
Champion spark plugs are zinc plated to reduce the chance of seizure in aluminum cylinder heads. Champion then applies Tin Tac” and ULTRASEAL’M coatings over the plating to further reduce corrosion and seizure. Anti-seize should NOT be applied to new Champion spark plugs.
2018 Yamaha FJR 1300A
2014 Honda CB1100 DLX
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