I guys I own a 08 F-150 cc 5.4L. I am looking at changing the spark plugs and have seen many threads on removal but not what people are buying. I would like to upgrade from the stock. I was looking at the E3 plugs. Any suggestions?

 

Opted for OEM SP515. Running great.

 

NGK Iridium IX's and they are just fine.

 

When I decided it was time to change the plugs (2006 Mark LT 4x2, 5.4, 35,000 miles) with the Motorcraft SP 515’s-

FYI- Why I choose Motorcraft.
In the 1970’s I ran (like many) Champion’s in just about everything (even had the gold palladiums), but stopped in the early 1980’s when they changed their copper-core design and the resulting quality problems that IMHO still exist today. Since then I have run Splitfire (non-platinum) in my old world (1960’s) cars, Bosch in my late 1990’s vehicles (both because the cylinder head design really prefers these types of plugs), but I really had hesitation because of the construction/component quality of the non-Motorcraft plugs and really questioned the durability in this application about the Motorcraft SP508 or SP 509’s which are single platinum. Given the types of loads and burn/flame promulgation rates in the chambers, I really had doubts about the style of the plug with single platinum having the ability to “survive” as long as they engineers said. What do ya know…the SP 515’s are double platinum.

 

I have the motorcrafts in mine. The old part number though not the sp515. Got the set of 8 off ebay for $32 from a ford dealer clearing out old stock. Changed them at 112k and never had a miss from the factory plugs so I had no fear of putting the same back in. I use the E3 plugs in my OPE but I have not seen many reviews for them in these trucks.