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Old 01-07-2020, 07:43 AM   #22
Knight
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Join Date: Jan 2008
Location: NJ
Posts: 4,130
My Ride: SL63 | SHO | E46
https://ricksfreeautorepairadvice.co...-plug-threads/

Some straight-forward info and also an interesting point about using anti-seize only if re-installing spark plugs that were once removed.

To the anti-seize on new plugs crowd, just be careful on torquing the plugs down.

Quote:
Originally Posted by NGK
NGK spark plugs feature what is known as 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 the use of anti-seize. NGK tech support has received a number of tech calls from installers who have over-tightened spark plugs because of the use of anti-seize.

Anti-seize compound can act as a lubricant altering torque values up to 20 percent, increasing the risk of spark plug thread breakage.
https://ngksparkplugs.com/en/resourc...ut-spark-plugs
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