New denso iridium POWER plugs 2007 yaris

[alanwagen]

Originally Posted by "G"

Denso are treated as well. Yes anti-seize is not recommended for denso either. But i only used a small amount since i knew they would be in the head for over 100k. Torque values? Yes that is true been when's the last time you used a torque wrench on plugs? Exactly never.

Torque values are also by feel. You could over torque it because of the lubrication action.
Also, using too much anti-seize could compromise the negative grounding, diminishing spark. I believe the engineers that make these plugs know more than you and me so I yield to their advise.

[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...