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Old 07-30-2010
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Default spark plugs
i think im gonna try the denso iridiums.

have any of yall replaced your plugs yet?

and if so, with what?

im sitting at 60k right now so i think its bout damn time.

EDIT:
it was all straight forward except you have to remove and replace the front driver plug from the wheel well.



second edit: after 2 tanks of gas i can report an average increase of 1.5-2mpg.

SUCH a worthwile mod.
Last edited by kerad11; 3 Weeks Ago at 08:55 AM.
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Old 07-30-2010
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holy shit.

18 views and nobody can say theyve changed out the plugs yet?

i guess i should take pictures for a write up if i run into anything out of the ordinary...
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Old 07-30-2010
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I doubt anyone but you has 60k on a 1yr old truck. I just turn 16k on mine and don't plan on changing my plugs anytime soon.
Last edited by rshadd; 07-30-2010 at 12:37 PM.
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Old 07-30-2010
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That would be cool if I was the first one to change the plugs on a v8 355.

Useless, but cool.
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Old 07-30-2010
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denso and ac delco are oem so you are good, also ngk tr5 are good
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Old 07-30-2010
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These trucks come with 100K mile Iridium plugs in them from the factory, you still have 40K left on them, maybe just check the gap?
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Old 07-30-2010
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Quote:
Originally Posted by Evilnut View Post
These trucks come with 100K mile Iridium plugs in them from the factory, you still have 40K left on them, maybe just check the gap?

If you believe plugs will last 100k I've got some beach front property in louisiana for sale : )

please don't tell me you use the oil life monitor too....
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Old 07-31-2010
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My last 3 gm's had over 100k when I changed plugs because of guilt. All were were fine, maybe the gap opened a little. With today's computers, and quality ignitions, plugs last. I doubt you could run that truck back to back on a dyno (or at the track) after a plug change and show me a significant change. Seat of the pants performance is BS.

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Old 07-31-2010
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My last 2 GM vehicles had 100K plugs & I changed them at that mileage, they were looking pretty good when I changed them. And I used the GM oil life system to change the oil in them too. Used high quality synthetic oil. Never had a problem in 130K miles on one & 160K on the other. Doing the same with the Colorado.

On my Silverado I did change the oil in between the GM oil life system recommendation a couple times as I raced that truck in Open Road racing a few times.
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Old 07-31-2010
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I never keep anything long enough to worry about plugs.
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