Spark plugs

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by CMDR BOB, Aug 31, 2013.


    CMDR BOB Member

    I have a 1998 gmc k2500 , 7.4 l , best vehicle i have ever owned ( i'm 70 ) looking for advice on which spark plugs to use, leaning towards gm delco. Thank you
  2. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    Generally considered the best choice for that engine, despite many people screaming about oem parts the one fact they never think about when oem parts fail is how many miles did you get before failure? They normally just allow the fact it failed to influence their decision while many times the parts have served a fair amont of time/miles.
  3. The_Duke

    The_Duke New Member

    Stick with AC Delco, you don't need to change.
    Last edited: Sep 12, 2013
  4. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    Agreed! Stick with the AC Delco that came in it. Now reason to switch to a "fancy" plug. I let the guys at autozone convince me one time to put autolite plugs in my 2002 5.3L silverado. It ran like crap, it idled rough. I left them in for a week. Then I could not stand it anymore. I put the ac delco in and it ran smoother than ever. I returned the autolite plugs and the guys at the counter looked at them, said that they looked fine. Nothing wrong with them. As I was talking to a manager another guy walked in to return his autolite plugs because he said that his sierra ran poorly after installing them. I am not saying that autolite are bad plugs. They just did not make my truck run well. Why not put what the manufacturer wanted back in.
  5. Caddiac

    Caddiac Epic Member 5+ Years 1000 Posts

    I agree with everyone else. They are good for 100,000 miles
  6. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner 1000 Posts

    Seems these run best with AC Delco. Just as a interesting side note. When I pulled my factory plugs to change out they had ac delco on one side and NGK on the other.
  7. BurbanMan

    BurbanMan Rockstar 3 Years 500 Posts

    Delco or NGK
  8. stchman

    stchman Active Member 2 Years 1000 Posts

    AC Delco plugs would be my choice. I'm big on OEM stuff as OEM stuff usually performs the best.
  9. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    I put my plugs through 196,000 miles and replaced them with Delcos so I think the stock plugs do best.
  10. Jacqson

    Jacqson Rockstar 100 Posts

    One more for AC Delco

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