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How many miles have you gotten on a set of stock plugs?

  • Less than 1000

    Votes: 15 13%
  • Between 1000 and 2000

    Votes: 33 29%
  • Between 2000 and 3000

    Votes: 20 17%
  • Between 3000 and 4000

    Votes: 11 9.6%
  • Between 4000 and 5000

    Votes: 10 8.7%
  • More than 5000

    Votes: 26 23%

How many miles on a set of spark plugs?

25K views 35 replies 25 participants last post by  64tbolt  
#1 ·
Assuming no other issues causing premature failure, how many miles should I expect to get out of my stock spark plugs? How many have you gotten?
 
#6 ·
Before the turbo, I still had the original plugs in it at 1200 miles and when I did the rebuild ( CP pistons and P&W crank, not wear issues) they looked new. Now I change them every spring but they looked great each time.
 
#19 ·
I put 100k on original Autolites in my truck before changing. Yea the gap was a little wide (65 thousanths) but they still worked. I pulled my original RZR plug (NGK Iridium) at 1200 and it looked brand new. Changed it anyway but using the old one as a spare.
If your EFI is working properly, plugs should last a very long time!
 
#16 ·
is this on a 900? If so whats the part number? thx
 
#22 ·
I'm close to the same miles on the OE plugs and belt.
I have no plans to change the plugs. Almost all cars go 100k on plugs now days so I figure if I'm not running rich (over fueling) and not burning oil the plugs should out last the machine. I will look at them every few years just make sure. So for now I voted 5000 on more
 
#27 ·
Ive got 7200km (4500ish miles) on my stock ones...im gonna change em soon though just cause the beds commin off for unrelated reasons...
 
#28 ·
I'm pulling mine after ~1100 miles to install a Weller Racing cam chain tensioner. Since its running well, I'll check the gap, anti-seize them and reinstall.
 
#30 ·
They were fine. Now at 1500 miles. Its fuel injected with electronic ignition and running unleaded fuel. If the NGK's don't last a long time I'll be surprised. Two new MR7F's as spares, though.
 
#31 ·
Just changed mine at 2900. The only reason I changed them was because I had a set in an oil change kit and I had the bed off to replace the throttle cable. Much, much better throttle response and acceleration, but like I said, I done the throttle cable at the same time.

Off topic, but check Your throttle cable adjustment. Mine had a lot of play and it or the plugs made a BIG difference.
 
#32 ·
In a perfect world, standard copper plugs will last about 30k miles before electrode wear and misfires become an issue. Especially so on boosted applications. Platinums and Iridiums can push the envelope to 100k+. I still don't like to push those beyond 60k anyway.

My RZR on the original plugs made it to about 750 miles until they got slight fouling from lots of cold starts and not allowing it to run. Caused cold running hesitation and misfires.

On my drag car, I would use standard coppers and change them out at least every other event.

Spark Plugs are consumables. Treat them as such.

Marcus