BEST spark plugs for the 4.0 SOHC?

Mike Tonon · Feb 11, 2019

Well, which ones and why?

6.2 · Feb 11, 2019

OEM plugs.

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Mike Tonon · Feb 11, 2019

6.2 said:
OEM plugs.

Sent from my LG-H873 using Tapatalk

I want to go with a higher grade plug from Motorcraft, but haven’t been able to find any for this engine, yet.

6.2 · Feb 11, 2019

OEM motorcraft are the best plugs for these engines. Using something more expensive isn't better. It will be worse. Plenty of threads and info about this all over the internet.

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Mike Tonon · Feb 11, 2019

Someone on here said Ford iridiums will go 100,000 miles, but stocks will really only go 10,000. I usually go at least 25,000 with stock Motorcraft plugs.

sgtsandman · Feb 11, 2019

I vote OEM. I have never seen any difference or benefits going with anything other than the OEM spec plugs with any vehicle I've owned. Some were actually worse in some way or another.

adsm08 · Feb 11, 2019

Double platinum should go 100K, but I'd replace them at 75K.

Iridiums will go farther, how much farther I don't know.

I gotta ask though, what's with all the threads lately? It seems like most of this could have been handled in a single thread.

Mike Tonon · Feb 11, 2019

adsm08 said:
Double platinum should go 100K, but I'd replace them at 75K.

Iridiums will go farther, how much farther I don't know.

I gotta ask though, what's with all the threads lately? It seems like most of this could have been handled in a single thread.

I just went to the dealer. They said the only plugs they have listed for this engine are platinum and were about $3.50 each. They recommend changing them after 100,000 miles.

All the threads because I thought I should separate everything into more specific categories. Should I have combined everything and posted in the general tech forum?

alwaysFlOoReD · Feb 11, 2019

I think the separate threads are good for people searching in the future.

adsm08 · Feb 11, 2019

alwaysFlOoReD said:
I think the separate threads are good for people searching in the future.

If the goal is simply knowledge for knowledge's sake, then yes. But when I see ten or twenty different threads from one user all pointing in one direction over the course of a week it makes me think "Is there a bigger question that isn't being asked".

Mike Tonon · Feb 11, 2019

adsm08 said:
If the goal is simply knowledge for knowledge's sake, then yes. But when I see ten or twenty different threads from one user all pointing in one direction over the course of a week it makes me think "Is there a bigger question that isn't being asked".

Like what? I thought this was America! I didn’t know this was a socialist country! I thought this was America!

alwaysFlOoReD · Feb 11, 2019

This site is based in America, but TRS is not a Democracy or a Republic. In some posts you are acting argumentative and being a general ______. I warned you once, this is your second. You won't get a third. In other posts you are asking and responding responsibly, please keep that up.

sgtsandman · Feb 11, 2019

Mike Tonon said:
I just went to the dealer. They said the only plugs they have listed for this engine are platinum and were about $3.50 each. They recommend changing them after 100,000 miles.

All the threads because I thought I should separate everything into more specific categories. Should I have combined everything and posted in the general tech forum?

That's pretty standard for platinum plugs. The OEM ones are mileage based as well but I can't remember what that is. It took me until last fall to hit that mileage with my 2011. Not a horribly short time period but it depends on what kind of mileage you expect to be driving your truck. Whatever you decide to go with, I strongly recommend you look up recommendations on how to change the plugs. Not getting at them at the right angle can make the job miserable. On the passenger side, I would highly recommend you go through the wheel well and pull the splash shield to do it. Coming in from the top is doable but a completely miserable experience with the back plug.

Mike Tonon · Feb 12, 2019

Yea! I’ve done the back passenger plug through the wheel well.

MattsRangerSport · Dec 18, 2023

Mike Tonon said:
Well, which ones and why?

That's a key point to why I registered here again with my current Ranger. As far as I can tell, 2010 Ford Ranger 4.0L should have Motorcraft SP498 plugs. Which are according to another forum, OEM spec. They are really double platinum. All the stores I found claim they are NOT compatible. Double platinum makes sense to me noticing the spec of the coil pack - 3 coils on a V6.

BEST spark plugs for the 4.0 SOHC?

Which spark plugs work best in the 4.0 SOHC?

Motorcraft stock

Motorcraft Iridium

Motorcraft Platinum

Other (list it in a comment)

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