Spark Plug part numbers?

[Pinned]

Wanting to change my spark plugs soon on my 2018, just want to go with stock plugs as they've been totally fine the last 70k miles. I see both SP-550-X and SP-594 listed as stock part numbers. Which one is correct?

Also, do either of these come pre-gapped correctly? If not, does anyone have a factory service manual page showing the gap, torque spec, etc?

Thanks all!

 

[tpostell]

curious on this as well!

 

[cptnslo]

I would like to know as well

 

[nikhsub1]

FYI SP-542 successor is NOT the SP-578

Went down this rabbit hole while on lockdown. The SP-578 is now the OEM plug for our trucks that is one step HOTTER than the old SP-542. The revised colder plug is now part number M-12405-35T, I don't believe there is an SP# associated with them anymore. The plugs are redesigned, have thinner...

www.fordraptorforum.com

 

[FiveOsvt]

I have the SP-550…Anyone know what the difference is in part numbers, hotter, colder?

 

[Hal993]

I'm living in the rabbit hole this first week.

Ford now lists SP-594 as the "service part". Factory installed for my 2020 was SP-578. Again, Ford currently lists the SP-594 as the Gen2/2020 spark plug for our trucks.

Go here and click on the red text and enter your VIN.