Motorcraft spark plugs

[Rubyred17]

Have any of you replaced your stock plug with replacement Motorcraft plugs yet? The originals are sp- 519 and replacements are sp-548

I believe The 519 is an iridium plug and 548 is a platinum model. If you switched did you notice any difference in idle or performance?

I can not find the 519s anywhere and before I do the 548 I wanted to see others experiences

Thank you

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[JAJ]

Well, you're not nearly confused enough yet... here let me help you.

If you go to the parts.ford.com website, you'll find the following plugs for your 2017 Voodoo engine:

SP-548 (as you found)
SP-590 (at a considerable price premium over the 548 - this might be the new iridium plug)

If you punch in the 2020 Voodoo engine, you get those two plus two more (ie- 4 to choose from):

SP-581 (the 2020 Predator/2020 Voodoo plug listed in the 2020 Owner's Supplements)
SP-581X (it's on the list, but it's not clear what the "X" means)

So, now you have a wide array of Motorcraft plugs to choose from.

If it were me, I'd take a close look at the 590. IIRC, the 2020 Voodoo/Predator engine has higher energy ignition coils and the 581 plugs might have a wider gap that may not work so well with the original coils.

You might also want to do some searching for @honeybadger posts on NGK plugs, which are available in platinum, iridium and ruthenium versions.

 

[dirtwarrior]

Go to Rock Auto. They can beat that price

 

[cosmo73]

Just changed my plugs today(16 GT350 with 27k miles). They were original and iridium’s and I put in the 548‘s which are indeed platinum. Car ran like it always has and the old plugs looked great(light brown/gray across all 8).

 

[CVCashmere]

Iridium has a melting temp of around 4,000 degrees. That should last a long time for high-temp applications. In regular cars, you can get 100K miles due to the lack of breakdown due to high temps.


CVCashmere

 

[galaxy]

Just changed my plugs today(16 GT350 with 27k miles). They were original and iridium’s and I put in the 548‘s which are indeed platinum. Car ran like it always has and the old plugs looked great(light brown/gray across all 8).

So why did you swap them out (soo early)?

 

[cosmo73]

Mostly to get a good look at them. I’ve always figured if I take the time to remove them(although this engine is about as east as it gets) I might as well put new ones in. Thankfully they were all extremely consistent without any oil, white powder etc. Just a light brown gray.

I didnt even realize they were platinum until I took them out fo the box to check gap. I don’t really care as I doubt there is really any significant difference. This is just a fun car for me on nights and weekends.

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