Spark Plug Life

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Mar 6, 2025 | 07:30 AM

#16

SpencerPJ

Fleet Mechanic

Joined: Jan 2020

Posts: 1,370

Likes: 417

Curious, 2020 3.5, 62k Do you guys change the plugs / boots when engine is cold or warm?

Mar 6, 2025 | 02:04 PM

#17

charlie g

FTE Community Team

Joined: Dec 2023

Posts: 8,911

Likes: 4,298

From: sussex county, nj

i do them cold

Mar 10, 2025 | 09:13 PM

#18

Raining111

Mountain Pass

Joined: Aug 2004

Posts: 215

Likes: 25

From: Massachusetts

I did my first plug change at 80k, which was too long. They were looking pretty dark. Been 50k since then, and the plugs have not looked as bad as the first time. Have never seen the need to change the boots, I have inspected them every time. I might do them on the next change as the truck has flipped over on 200k now.

Mar 11, 2025 | 07:04 AM

#19

SpencerPJ

Fleet Mechanic

Joined: Jan 2020

Posts: 1,370

Likes: 417

Just an FYI, my 2020 3.5, 63k, I feel the plugs could have gone longer. All gaps 31-32.

Mar 12, 2025 | 12:44 PM

#20

fe390pc

Logistics Pro

Joined: Mar 2009

Posts: 4,859

Likes: 610

From: Minnesota

I am on borrowed time it seems, I have a 2.7ECO and still run the original plugs at 122Kmi. I am averaging 19.3mpg and she idles pretty good. My question is where do you buy your plugs and boots as I want to swap mine.

I do my oil between 3 and 5k, have had the transmission flush done and pulled the rear driveshaft and re-lubed the slip joint to eliminate that clunk.

Mar 12, 2025 | 05:20 PM

#21

SpencerPJ

Fleet Mechanic

Joined: Jan 2020

Posts: 1,370

Likes: 417

Quote:

Originally Posted by fe390pc

I am on borrowed time it seems, I have a 2.7ECO and still run the original plugs at 122Kmi. I am averaging 19.3mpg and she idles pretty good. My question is where do you buy your plugs and boots as I want to swap mine.
I do my oil between 3 and 5k, have had the transmission flush done and pulled the rear driveshaft and re-lubed the slip joint to eliminate that clunk.

I got my plugs and boots from Rock Auto. I also bought oil and filter, air filter and cabin filter and with shipping was more than fair. I was disappointed in the shipping though, everything thrown in a box, lightly packed. My air filter was crushed from the 5qt jug of oil,but I made useable.

Mar 13, 2025 | 09:03 AM

#22

fe390pc

Logistics Pro

Joined: Mar 2009

Posts: 4,859

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From: Minnesota

Thanks PJ, I will have to look at them. Been buying my Motorcraft oil at Walmart since they have the best price so far.

Mar 13, 2025 | 10:51 AM

#23

JKBrad

Moderator

Joined: May 2005

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From: San Antonio, TX

Oil is the only reason I go to Walmart

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Mar 13, 2025 | 01:29 PM

#24

fe390pc

Logistics Pro

Joined: Mar 2009

Posts: 4,859

Likes: 610

From: Minnesota

Same for me, But I see it is pretty reasonable on Rock Auto.

Mar 14, 2025 | 08:18 AM

#25

GlueGuy

Lead Driver

Joined: May 2015

Posts: 5,889

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From: Mts. S. of San Francisco

Quote:

Originally Posted by JKBrad

Oil is the only reason I go to Walmart

I 'spose we could do that, except it's a 3-hour drive to get to the nearest Walmart.

Mar 14, 2025 | 11:37 AM

#26

JKBrad

Moderator

Joined: May 2005

Posts: 8,232

Likes: 1,248

From: San Antonio, TX

Quote:

Originally Posted by GlueGuy

I 'spose we could do that, except it's a 3-hour drive to get to the nearest Walmart.

I envy that actually. I remember when it would take an hour to get to the closest one. I didn't move closer to a Walmart, Walmart moved closer to me.

Mar 14, 2025 | 10:19 PM

#27

tseekins

Super Moderator

Joined: Jan 2008

Posts: 40,042

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From: Maine, Virginia

I go to wally world for oil and their amazing chicken tenders!

Mar 15, 2025 | 10:21 AM

#28

GlueGuy

Lead Driver

Joined: May 2015

Posts: 5,889

Likes: 360

From: Mts. S. of San Francisco

Quote:

Originally Posted by tseekins

I go to wally world for oil and their amazing chicken tenders!

We use Costco for that, except it's pizza and hot dogs.

Mar 18, 2025 | 06:50 AM

#29

fe390pc

Logistics Pro

Joined: Mar 2009

Posts: 4,859

Likes: 610

From: Minnesota

Great, now I am hungry and need oil!

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