When you use antisieze on a spark plug you are getting it in there tighter at the same torque rating. Hence causing metal shell stretch and a hotter plug, hence serious engine damage.
© 2022 Thomas Murphy
Ps I would never use copper a/s on an aluminum block as an outboard mfg once said that copper oxidizes Aluminum. Also I think the silver/graphite ones form a caramelize caking.
You will see in some modern car 3rd party auto manuals to use a/s on plugs. A 3rd party outboard manual states to use a special grease with theirs. However that o/b co has stopped production all together.
But it is an interesting topic.
There are many different metals used in various antisieze compounds. The melting point and other properties are something to think about.
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