Quoted From WDHewson:
Dreamer:
Good question about spakplug antiseize.
The first thing I do when buying a vehicle, new or old, is apply a bit of antiseize on the sparkplug base threads. Lawnmowers too, come to think of it.
However, these antisieze coumpounds have metallic copper, lead, maybe zinc, which will poison your catalytic converter……so apply very little. I own a fair number of engines, and two tubes of antisieze are still about half full.
This is ‘kind of’ the issue. My philosophy has always been ‘if they didn’t put it there at the factory what makes me think I know better?’ With antisieze on plugs especially the copper type you are basically putting a conductor on the end of the plug, get too much on and you could short it out. Lastly I like oil better because it doesn’t leave a mess in the spark plug tube and for me seems to work much better at getting the plug threaded in correctly, I really haven’t seen any benefit from useing antisieze on spark plugs.