gknoerlein

2012 Ford F-150 Ecoboost Crew cab XLT
What Motorcraft Spark plug number should I use?
SP-534 CYFS-12Y-T3
SP-534 CYFS-12Y-T4
SP-580
or some other

ProjectSHO89

Go to www.fordparts.com (Ford's official parts site) and look it up by your VIN.

gknoerlein

Thank you.

Steve83

...or look on the VECI label under the hood.

(phone app link)

American Made

use the ford plugs...gap them properly i think there was a new spec on that, i don't remember if it was .028 or .030. torque them as well to spec. use anti-seize on the threads.

kozal01

iTrader: (2)

Ford specifically says to NOT use anti-seize on the threads if you use Motorcraft plugs. The updated plug is the SP-580. Local parts stores have stopped carrying the others.

American Made

strange cause the original plugs i removed had anti-seize on them. So i reapplied it lightly, had no issues with it yet.

gknoerlein

gap numbers keep changing. owners manual gives .033-.037 range.
been told that the motorcraft plugs come pregaped.
been told not to try to regap iridium plugs because you might brake them.
things are getting confusing

kozal01

iTrader: (2)

You probably wont but its easy to over-torque them with any type of lubricant on them. My stock plugs did not have any kind of anti-seize on them when I took them out recently.

The SP-580's I got were pre-gapped to .032", verified with feeler gauges.

ProjectSHO89

Virtually guaranteed to have been superseded by a service part number.