New denso iridium POWER plugs 2007 yaris

[tmontague]

Originally Posted by alanwagen

I believe the engineers that make these plugs know more than you and me so I yield to their advise.

Sure, except they are not the ones having to deal with seized plugs down the road. I always use a small amount of anti seize ad hand snug them. Never an issue on either my heavily tracked yaris or my families Vibe.

To each their own, however the recommendation that the engineers or the manufacturer knows better is an old one that doesnt hold much weight for many things involving cars. Oftentimes a decision like that will be made simply because if one or two DIY'ers who will over apply and foul a plug. This fear causes a blanket statement to be made and is not necessarily in the best interest of a knowledgable DIY'er.
- just ask all of those Ford truck owners how happy they are that the factory didn't apply anti seize to their plugs, since they know the best and all...