Changing plugs this weekend

[dzknmd1]

I plan to finally change the spark plugs in my '03 base Vibe with almost 120K miles on it. The car still gets the same mileage that it has always gotten, around 32 mpg, so I expect that the old one's might come out looking like they could go another 100K.Anyway, I have never worked with aluminum heads before and I have some trepidation about seized plugs after all these miles and pulling the threads out of the head. I know the engine needs to be room temperature. Can someone with experience with this tell me if there is any evidence that the factory uses anti-seize compound on the original install? I need to hear that my concern might not be warranted. I am using the OE plugs to go back in there, Denso SK16R11. I will be grateful for any and all advice.

[blindman10]

While I have significantly fewer miles (70k), I recently replaced the factory plugs and had no issues whatsoever. Obviously after that many miles/years the plugs are snug, but nothing you can't handle. To be honest, I couldn't tell one way or the other if anti-seize was used at the factory, but I like to think that they would be smart enough to use some with steel plugs in an aluminium head.Do it with the engine cool and you should be fine.

[Cougar Vibe]

According to both Denso & NKG, their iridium plugs come w/trivalent chrome coating...which is supposed to eliminate the need for anti-seize.As such, I didn't use any when I installed my NKG IX's the other day, but then I doubt I'll still have my Vibe when it comes time to replace them.

[dzknmd1]

Thanks for the replies fellas. I probably should not be such a worry wart. It's just that the thought of damaged aluminum threads is something I would hate to have to deal with. I have plenty of experience with cast iron heads.