Prefered Plugs?
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Senior User
Joined: Jan 2019
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From: Los Angeles, CA
Prefered Plugs?
I am getting all my ducks in a row so when I bring the X home I can take it to my guy to have him do the oil, oil filter, fuel filter, trans fluid and filter, air filter.
Now my question is about plugs. I already have the denso boot set ready to order but i want to know the ideal plugs. In my DD i have iridium plugs, is that an option for the X or should I stick with the nickel/platinum combo that was stock? Also, what are the odds of needing new coils? The X im looking at is an '03 6.8L with 140k on the clock.
Now my question is about plugs. I already have the denso boot set ready to order but i want to know the ideal plugs. In my DD i have iridium plugs, is that an option for the X or should I stick with the nickel/platinum combo that was stock? Also, what are the odds of needing new coils? The X im looking at is an '03 6.8L with 140k on the clock.
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Joined: Jul 2010
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From: Media PA
The COPs live long lives, until they die, when that happens you will have a miss, so no need to replace good functioning COPs, maybe buy one of the Denso units to keep in the EX as a spare if one goes out on you while on the road. I carry 2 of the Denso COPs as spares but am still on all 10 originals at 120K miles.
The Motorcraft FL-820S oil filter is the one you want, it has the correct internals, some other brands lack.
Is your guy going to fully flush the trans or just do a pan drop and drain? The flush will change out ALL of the ATF while a drop and drain only gets 6/7 quarts changed out. Mark K's flush procedure is very easy to do and can be found up in the Tech Folder.
These motors seem to drink a little more oil with the lighter 5W-20 vs the 5W-30, I always run with the heavier oil.
Cross-Country
Joined: Jan 2019
Posts: 63
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Plugs
thoughts on duralast coils? They have a lifetime warranty and my previous 5.4 went through a couple every few months it seemed. Nice to just swap it out for a new one. But if motorcraft is better and last longer, should I just stick with those?
Moderator
Joined: Jul 2010
Posts: 12,050
Likes: 1,549
From: Media PA
COPs for these motors should last a very long time, mine have 120K on them and I expect a few more years out of them.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
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New User
Joined: Jan 2019
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From: DFW
+1 on Motorcraft. I stick with OEM for all of my cars unless it calls for Bosch. Avoid Bosch like the plague.
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