Is there a particular type of Anti-Seize compound that is preferred for use on spark plugs? What temperature rating is needed?
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Most people use Copper because it's the most common and cheapest, but beware the cheap/generic stuff that's only good to 600°F or so. I use the Nickel type, not so much for the temperature (2400°F), though that is a bonus, but because there are some metals that you can't use the copper on (Titanium might be one, I'm not 100% but Nickel is fine for it).
As far as temperature rating needed, according to NGK, it will depend on the hot/cold value of the specific plug, but optimal range is 500°C (932°F) and 800°C (1472°F) for the part that extends into the cylinder. The threads are on the water cooled block, so I'd expect them to hover in the 300°F - 600°F range. You can probably get away with Copper, but I'd use Nickel.
The highest heat range. The price difference is only a couple of bucks and you don't do the job often enough to worry about it. If you get one "oxygen sensor safe" you can reuse it throughout your exhaust system on other jobs you may have that requires antisieze compound.