2017 Eco 6, just turned 100k. Time for plugs??

I looked in all the paperwork for the truck and cannot find a maintenance schedule.

When should they be changed??

Yes it’s time to do them at 100k according to the manual. Most do 60k because the turbo engines are hard on plugs.

Thank You!

Scheduled maintenance starts on page 443 of the manual. It recommends changing plugs at 100K, though I would advise changing them a bit sooner on any engine.

Jeff T said:

I looked in all the paperwork for the truck and cannot find a maintenance schedule.

When should they be changed??

Click to expand...

I have a 2015 Expedition Limited 4x4, purchased new, with the 3.5 Ecoboost engine.

75% of my driving is on rural state highways, and I have never towed or hauled heavy cargo - strictly passenger use.

I changed the original spark plugs at about 45,*** miles. They were black and full of carbon, and the gap had opened considerably. I used OEM replacement plugs.

I have not seen spark plugs look that bad since the 1960’s and 1970’s. I use top-tier fuel and drive conservatively.

When you change the plugs - let us know how they looked.

I changed my plugs at 55k and my findings were just like above.

Whatever Ford says for all scheduled maintenance cut that number in half. At least that is what I do.

Thirded.

^

"But... but... but.... Don't Ford engineers know what's best for the trucks they designed????"

/sarcasm


(I just had to, due to back and forth arguing in another thread regarding "Ford recommended" fluid change intervals!)

Change Sooner! 100K is WAY too long on this motor!


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762mm said:

^

"But... but... but.... Don't Ford engineers know what's best for the trucks they designed????"

/sarcasm


(I just had to, due to back and forth arguing in another thread regarding "Ford recommended" fluid change intervals!)

Click to expand...

It's an inherently stupid debate on both sides since the engineers are not the ones that provided those recommended intervals to begin with. If those recommendations came from them, they wouldn't be the same on every single vehicle, but rather would be based on the specifics of that particular vehicle. The engineers make their recommendations and we rarely ever get to know what they actually are because they've been filtered down through corporate bureaucracy ten times over in order to meet whatever standards are necessary to sell more vehicles. If your vehicle has a maintenance cost that is 3x that of the other guy, that's going to negatively impact the bottom line, so it's not getting published. Chevy has an SUV that gets 21 mpg and we can get 22 mpg by changing the recommended oil? Done. That didn't come from the engineers.