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#4490477 - 08/16/17 07:23 PM Plugs have 130K and mpg same as when new,Why?
PalmSpringsSCal Offline


Registered: 08/28/10
Posts: 68
Loc: SouthernCaliforniaDesert,USA
I bought my 01 mitsubiti Montero Sport with a 3.0 new in 01 . I havent had to replace my plugs or wires in 130K. It performs & mpg no different since new. Average trips Hwy/road ,or fwy typical hwy mpg since 2001 has been 19 to 22 mpg.
Anyone got any ideas how why so long? I may never be able to get them out when that time comes though.


Edited by PalmSpringsSCal (08/16/17 07:30 PM)

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#4490482 - 08/16/17 07:34 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
PimTac Online   content


Registered: 03/04/17
Posts: 4228
Loc: Soviet State of Washington
Those iridium plugs last a good long time. I've run a couple of sets beyond 100k. When they got changed I looked at the old ines and they still looked and worked just fine.

Btw; I had a 2000 Montero Sport, same engine. Great vehicle.


Edited by PimTac (08/16/17 07:35 PM)
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#4490483 - 08/16/17 07:35 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
spasm3 Offline


Registered: 05/30/10
Posts: 8641
Loc: North Carolina
Platinum or Iridium, they last longer than copper decades ago.
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13 elantra 68k 5w30 QSUD
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#4490487 - 08/16/17 07:42 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: spasm3]
SatinSilver Offline


Registered: 01/24/08
Posts: 10128
Loc: OH
I was shopping for some NGK or Denso plugs recently and noticed three different types of Iridium plugs all prices within a few nickels of each other. So I emailed one of the guys on here about it and learned this:

Originally Posted By: namegoeshere
The laser is the best plug the ix the worst, the IX has a single precious metal electrode, the long like a thicker core and the laser has precious metal on both electrodes.

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#4490497 - 08/16/17 07:57 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
9050lx Offline


Registered: 11/07/08
Posts: 114
Loc: FL
I have run motorcraft platinums twice to 100,000 miles.

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#4490522 - 08/16/17 08:16 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
They just haven't yet reached the point that spark strength is affected. I, personally, would rather replace them early than push them until I find that point - such experiments can be hard on other ignition components. But I, too, have seen plugs with plenty of visual wear on them that hadn't yet started to affect how the engine performed.
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'13 Cruze, 1.4T, 112K
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#4490538 - 08/16/17 08:29 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: Minnesota
Technology has come a long way since the coil and rotor cap and changing every 15-20k
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#4490574 - 08/16/17 09:10 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
merconvvv Offline


Registered: 07/10/16
Posts: 682
Loc: il usa
California weather makes the plugs happy smile
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#4490602 - 08/16/17 09:56 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 704
Loc: Canada


Any vehicle with engine management computers and fuel injection can have uniform
MPG performance over several years and 130K - that's the new normal.

However, if you ever get an engine misfire, get to it right away, most cars have
at least 2 cat converters that will get burned up by raw gas from a misfire, then you're
looking at $$ to replace the cats.

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#4490616 - 08/16/17 10:32 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
PalmSpringsSCal Offline


Registered: 08/28/10
Posts: 68
Loc: SouthernCaliforniaDesert,USA
Woops I had a brain [censored].It has 230K mi not 130K

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#4490623 - 08/16/17 10:38 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PimTac]
PalmSpringsSCal Offline


Registered: 08/28/10
Posts: 68
Loc: SouthernCaliforniaDesert,USA
Yep! I never had a part fail. I did replace timing belts at 80 to 100K and had them replace the water pump,hoses belts,thermostat,but thats all. I am amazed too,so last year I bought another one. Same model etc Has 140K
Im neglectful on maintenance too,

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#4490629 - 08/16/17 10:43 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: bioburner]
PalmSpringsSCal Offline


Registered: 08/28/10
Posts: 68
Loc: SouthernCaliforniaDesert,USA
Yes,as I recall chevys and fords recommended 6000 mi plug changes and I think points were the same. I followed their recommendations until I was 19 or so and found 20K was fine. Oh sure,if I romped the engine it might miss at the points or plugs,but i still got 15-20 hwy with 283,289 and 351 engines....as I recall. By 72 or sos I put in a mallory light distributor insert and never had to screw with points again. Best 20 or 40 dollars(I think) I ever spent


Edited by PalmSpringsSCal (08/16/17 10:48 PM)

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#4490635 - 08/16/17 10:53 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
raytseng Online   content


Registered: 12/11/08
Posts: 2333
Loc: CA
the mpg might be the same but you may have lost a little performance and not noticed.

your decision now depends on if you ever want to do it or not.
if you see yourself doing it eventually, might as well do it now so you get use out of the new plugs.

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#4490637 - 08/16/17 10:59 PM Re: Plugs have 130K and mpg same as when new,Why? [Re: i_hate_autofraud]
PalmSpringsSCal Offline


Registered: 08/28/10
Posts: 68
Loc: SouthernCaliforniaDesert,USA
Oh thanks, Better get to it then.

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#4490685 - 08/17/17 02:31 AM Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal]
Artem Offline


Registered: 10/30/10
Posts: 5117
Loc: Florida
Originally Posted By: PalmSpringsSCal
Woops I had a brain [censored].It has 230K mi not 130K


So... 230k miles on the original plugs? Niiiice.

I suppose you could go by the good ol' "if it ain't broke don't fix it" motto and just leave them alone. How much longer do you plan on keeping the vehicle?
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