Should I use certain spark plug grease when changing spark plugs?

[Jetronic]

Most modern plug manufacturers, like NGK, advise against using anything on the threads. Like anti sieze.

These plugs have a coating on them already.

Aside from that, a little silicone grease on the inside of the boot at the very end can help plug wires come off more easily in the future. But it isn't generally needed.


"Do not use anti-seize or lubricant on NGK spark plugs. It is completely unnecessary and can be detrimental. "

https://www.google.com/url?sa=t&sou...MQFnoECA4QBQ&usg=AOvVaw2ZxUn5Ka8QJJhBQDvYu3q8

yet the coated plugs are the ones that are stuck when it's finally time to remove.

 

[CivicFK2TypeR]

If you drive little and change the spark plugs every 6 years, you should be on the right track.

 

[Snagglefoot]

Bingo! This is what a lot of people don't realize. Years ago cylinder heads were all cast iron, and you were lucky if you got 12,000 miles out of a set of plugs.

Today many engines have Aluminum heads, and the thread length of many of the spark plugs they use is much greater than it was, "back in the day".

Some of these newer engines utilize spark plugs that have over an inch of thread or more. That, along with leaving them in the Aluminum heads for 100,000 miles or more, and it's asking for trouble without using at least some type of anti seize lubricant on the threads.

This is the spark plug called for in Chevy Gen V engines. It is over an inch long.