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Plugs have 130K and mpg same as when new,Why? #4490477
08/16/17 06:23 PM
08/16/17 06:23 PM
Joined: Aug 2010
Posts: 68
SouthernCaliforniaDesert,USA
PalmSpringsSCal Offline OP
PalmSpringsSCal  Offline OP
Joined: Aug 2010
Posts: 68
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.

Last edited by PalmSpringsSCal; 08/16/17 06:30 PM.
Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490482
08/16/17 06:34 PM
08/16/17 06:34 PM
Joined: Mar 2017
Posts: 6,517
...
PimTac Offline
PimTac  Offline
Joined: Mar 2017
Posts: 6,517
...
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.

Last edited by PimTac; 08/16/17 06:35 PM.

Cannot see signatures any longer so it doesn’t matter.
Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490483
08/16/17 06:35 PM
08/16/17 06:35 PM
Joined: May 2010
Posts: 9,475
out there
spasm3 Online content
spasm3  Online Content
Joined: May 2010
Posts: 9,475
out there
Platinum or Iridium, they last longer than copper decades ago.


13 elantra 72k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 7300 miles m1 0w30
Re: Plugs have 130K and mpg same as when new,Why? [Re: spasm3] #4490487
08/16/17 06:42 PM
08/16/17 06:42 PM
Joined: Jan 2008
Posts: 10,968
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,968
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.

Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490497
08/16/17 06:57 PM
08/16/17 06:57 PM
Joined: Nov 2008
Posts: 132
FL
9050lx Offline
9050lx  Offline
Joined: Nov 2008
Posts: 132
FL
I have run motorcraft platinums twice to 100,000 miles.

Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490522
08/16/17 07:16 PM
08/16/17 07:16 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
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.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490538
08/16/17 07:29 PM
08/16/17 07:29 PM
Joined: Sep 2016
Posts: 1,418
Minnesota
bioburner Offline
bioburner  Offline
Joined: Sep 2016
Posts: 1,418
Minnesota
Technology has come a long way since the coil and rotor cap and changing every 15-20k



97 Ford E350 D,99 F350 dually D
13 Scion Xb
12 Ford Transit Connect
06 Nissan Xterra
03 K1200 BMW
07 Kawasaki KLR650
13 Madass
Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490574
08/16/17 08:10 PM
08/16/17 08:10 PM
Joined: Jul 2016
Posts: 682
il usa
merconvvv Offline
merconvvv  Offline
Joined: Jul 2016
Posts: 682
il usa
California weather makes the plugs happy smile


1988 Mazda RX7 na PP 10w30 Noack 4.7
1994 Chrysler Concorde 3.3
1999 Ford Expedition 4.6 QSUD 10W30 NOACK 5.0
Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490602
08/16/17 08:56 PM
08/16/17 08:56 PM
Joined: May 2016
Posts: 718
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 718
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.

Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490616
08/16/17 09:32 PM
08/16/17 09:32 PM
Joined: Aug 2010
Posts: 68
SouthernCaliforniaDesert,USA
PalmSpringsSCal Offline OP
PalmSpringsSCal  Offline OP
Joined: Aug 2010
Posts: 68
SouthernCaliforniaDesert,USA
Woops I had a brain [censored].It has 230K mi not 130K

Re: Plugs have 130K and mpg same as when new,Why? [Re: PimTac] #4490623
08/16/17 09:38 PM
08/16/17 09:38 PM
Joined: Aug 2010
Posts: 68
SouthernCaliforniaDesert,USA
PalmSpringsSCal Offline OP
PalmSpringsSCal  Offline OP
Joined: Aug 2010
Posts: 68
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,

Re: Plugs have 130K and mpg same as when new,Why? [Re: bioburner] #4490629
08/16/17 09:43 PM
08/16/17 09:43 PM
Joined: Aug 2010
Posts: 68
SouthernCaliforniaDesert,USA
PalmSpringsSCal Offline OP
PalmSpringsSCal  Offline OP
Joined: Aug 2010
Posts: 68
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

Last edited by PalmSpringsSCal; 08/16/17 09:48 PM.
Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490635
08/16/17 09:53 PM
08/16/17 09:53 PM
Joined: Dec 2008
Posts: 2,407
CA
raytseng Offline
raytseng  Offline
Joined: Dec 2008
Posts: 2,407
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.

Re: Plugs have 130K and mpg same as when new,Why? [Re: i_hate_autofraud] #4490637
08/16/17 09:59 PM
08/16/17 09:59 PM
Joined: Aug 2010
Posts: 68
SouthernCaliforniaDesert,USA
PalmSpringsSCal Offline OP
PalmSpringsSCal  Offline OP
Joined: Aug 2010
Posts: 68
SouthernCaliforniaDesert,USA
Oh thanks, Better get to it then.

Re: Plugs have 130K and mpg same as when new,Why? [Re: PalmSpringsSCal] #4490685
08/17/17 01:31 AM
08/17/17 01:31 AM
Joined: Oct 2010
Posts: 5,410
Florida
Artem Offline
Artem  Offline
Joined: Oct 2010
Posts: 5,410
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?


2014 Mazda 3 Hatch 2.0L & 6spd - Idemitsu 0w20 Synthetic @ $0.75 a quart. (thanks Advance Auto Parts for the awesome deal)
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