My Dealer told me to change the Plugs at 60,000mi on my 2007 5.4 3v, At to avoid any possible plug problems. At what mileage do you guys change your plugs out at on the 5.4 3v's?.................

 

This is a explosive topic

When Brand new - R&R with antiseize as per TSB. ( still not applied @ the factory)

Then inspect @ 30K.

Replace no later than 50K.


Having said that, you will shortly be getting responses that are all over the map.

Best thing I can tell you is to find every single post on these plugs on this site, read 'em all, watch the video, then decide.

BTW ... I did that, and the advice I provided was the result. My truck, my choice.

Good luck.


MGD