any of you lightning owners have problems witht the stock agsf 12 fm plugs? i am doing the swap on my expedition(see sig), and ordered these plugs, but some are telling me to use ngk instead. i'd rather use the m/c since i already have them.

 

Either...or! Both are good plugs! I would say no real benefit of one over the other on a basically stock motor. I ran the stock plugs on my L for 48K miles with no problems!

 

Thanks

 

I changed out my Stock plugs after 70,000 miles and they were still good, I put a fresh set of stock ones in to replace them, I love the motorcraft plugs.

 

I run the stockers as well.