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Old 03-16-2020, 01:47 AM   #1
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90k Plugs. Fact or Fiction?

I've been reading where the V10's plugs are good to 90k. Call me skeptic.

Does anyone have experience with the claim? If not, does anyone know which cylinder may run the hottest? I can use it as my checkup; everything else is equal.

Thanks.
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Old 03-16-2020, 01:52 AM   #2
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Most plugs are good to 100 K miles in the age of unleaded gasoline.
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Old 03-16-2020, 02:50 AM   #3
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I watch a lot of youtube videos where guys flip old import cars. I'm talking cars with 150k plus miles. They always change the plugs and most of the time they are factory original. If the owners manual says the plugs are good for 90k, then I would believe it.
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Old 03-16-2020, 10:44 AM   #4
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I pit 130,000 on a set. remove, clean and reset.
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Old 03-16-2020, 11:19 AM   #5
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What are spark plugs lol
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Old 03-16-2020, 11:21 AM   #6
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I'm on my 3rd V-10 haven't changed a set of plugs yet (first two went 138,000 miles and 75,000 miles respectively before I got rid of them).
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Old 03-16-2020, 04:26 PM   #7
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Awesome. Thanks again.
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Old 03-16-2020, 04:40 PM   #8
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Quote:
Originally Posted by The_Breeze View Post
I've been reading where the V10's plugs are good to 90k. Call me skeptic.

Does anyone have experience with the claim? If not, does anyone know which cylinder may run the hottest? I can use it as my checkup; everything else is equal.

Thanks.
Back in the day, ethylene bromide was added to leaded gasoline. This was to help remove lead from the combustion chamber and spark plugs. It worked so well that it removed the steel parts of the plugs also. After 3 to 5 thousand miles the plug were eroded enough to cause misfiring under load. Removing ethylene bromide and lead from pump gas did away with spark plug erosion.
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Old 03-16-2020, 04:58 PM   #9
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My 2014 Ford Expedition Service Schedule said to change the plugs at 105,000 miles.
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Old 03-16-2020, 08:41 PM   #10
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You are more likely to have a coil fail now on higher mileage units
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Old 03-16-2020, 08:46 PM   #11
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I figured equivalent wear must depend on engine load and RPMs to some degree, so for my relatively small and light van with tall gearing, I let it go to around 160,000 miles ó donít recall exactly.

I did keep close eye on fuel economy to see if there was any decline, and on emissions reports generated during state inspections. And also subjective performance. There was no noticeable decline.

I put it off because itís expensive (could not do it myself at the time), plus I wasnít sure I was keeping van. While I could have waited longer, I went ahead and had them replaced.

If the same V10 was in a motorhome weighing twice as much as my van, and getting half the mileage, I would have done it much sooner.
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Old 03-21-2020, 06:18 PM   #12
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Really hard to tell. I only kept my 2015 Thor Hurricane 34E with V10
for 3 years and 15K miles.
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Old 03-21-2020, 06:48 PM   #13
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I can remember my Dad buying spark plugs by the case...
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Old 03-21-2020, 09:00 PM   #14
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2005 F-250 V-10 Plugs

We're new to MHs but we have a 2005 F-250 V-10 being used mostly for a 4 horse trailer. Being old school points, plugs & condenser kinda guy, I didn't believe the owners manual when it said 100k on the plugs so I said I'm going to go to the failure point. 261k miles it threw a #1 & #9 misfire code. Changed out the plugs & coil packs ($750 in parts & all day!). Runs like new! No visible damage to the plugs so I don't know If it was plugs or coils.
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Old 03-21-2020, 10:12 PM   #15
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Being a retired Ford Master Technician, I can say that 100K is very common. I have seen higher mileage with no issues, as stated previously coil failure is more common to cause an intermittent miss, usually the boot is the failed part.
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Old 03-21-2020, 10:20 PM   #16
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I have a 2003 Expedition with a 5.4. plug change @ 159000. I know it's not a v-10 but basic same block with extra up and down thingys...lol
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Old 03-22-2020, 12:55 AM   #17
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It all sounds good. But wait until you see the bill when the sparkplugs are frozen in the engine block and/or break off. I will never wait until 100K to change plugs again.
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Old 03-22-2020, 03:00 AM   #18
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If the engineers say your good to 90k, then you are.
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Old 03-22-2020, 10:56 AM   #19
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TSB 08-7-6/V-10 Plugs

Quote:
Originally Posted by Junodtim View Post
It all sounds good. But wait until you see the bill when the sparkplugs are frozen in the engine block and/or break off. I will never wait until 100K to change plugs again.
Ford put out a TSB in 2008 on changing the plugs. It covers all Triton engines not just the V-10. Follow it EXACTLY & most likely you won't break the plug. It also says to put anti-seize on the new plugs to prevent them from seizing. AutoZone has the toolkit you can "rent" in case you do break one. I also recommend OEM replacement plugs-at 261k miles, why wouldn't you? 👍
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Old 03-22-2020, 12:07 PM   #20
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I'm starting to think that my Sprinter-chassied RV has more advantages than I originally thought...
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