Ford changed the spark plug part number?

SJRaptorG2 said:

the 550s are at 28. Depending on how much the old plug gaps widened, I will probably leave them at 28 and see what happens. I have over 18000 mi on it now so the old plugs should show me something.

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SJRaptorG2 said:

Just want to put this out………
Went to dealer for spark plugs, he looked them up using the vin and said it was a special order. Picked them up today and immediately noticed that they are Motorcraft sp550s. I told the parts rep that I believe the manual calls for sp534 plugs. He re-checked with vin and yr/make/model/raptor, also made a call. He said that’s the current part number from ford but If I want sp534s he has a bunch of those. Took the 550s. Maybe ford changed the plugs? I also checked fordparts.com and it’s sp550s. Not much info online about this plug part number. Thinking it’s a new number?

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solarwinds said:

wow you changing plugs at 18k ? any reason or just ?
the owners manual has the 534 but thats just for eco 3.5. not 3.5 ho. might be same but might not be. the owners manual is for just all f150s. so raptor specific is mostly not listed[/QUOTE

The Raptor specific supplement manual says 534.

I'm changing them just out of curiosity. I took delivery 1/31 and have been driving pretty hard. I like to put it in WOT . Read that the ecoboost plug gaps get wider in as little as 10000mi when driven hard. So I figured I would pull mine and see how they are holding up, might as well change them if i'm taking them off.

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