dealer only spark plugs??

[homersipes]

so I was going to change the plugs in my 2003 gmc 2500HD 6.0 pulled the plug out to get number and it has 2 numbers on it:ACDelco 12567759 and NGK pztr5a 15.  I have never seen this before but whatever, so I go to the parts store and they couldnt cross reference it over and their computer says its 2 different plugs.  Another parts store couldnt pull up either number and a napa couldnt cross it either.  So when I got home I called the dealer and he gave me: ACDelco 41805.  Under the hood lists the plugs to be gapped at .060 but the dealer told me to gap at .040.  I dont quite understand this, has anyone else had this experience?  and they are 10 dollars a whack, I changed all 6 in my blazer for 20.

[Babalonian]

I haven't seen CAP on the forums all day.... check the WWI arena. 

[SilverZ06]

First and foremost I only use NGK plugs in everything I own so that is the path I am going to take you down. The pztr5a looks like it was replaced by a    PTR5D-10 ngk stock number 3784. These are the premium Lazer Platinum plugs. If you like spending $80 to change a set of plugs be my guest. I would just slap in some standard NGK TR5 2238. Gap both at .040 The TR5's will last plenty long and cost a lot less. I ran the V power plugs in everything from my turbocharged ricer to my Corvette Z06 and never had any problems.

http://marylandspeed.com/ngk-vpower-tr5-spark-plugs-040-gap-gm-lsx-v8-applications-set-of-8-ngk-2238-8-p-1620.html
 

http://www.ngksparkplugs.com/part_finder/index.asp

[smoe]

I think I would call around to other parts stores before using something possibly different than factory.

My old pappy always told me to use only factory recomended parts.

[homersipes]

I agree with using only factory plugs, the only place I can get plugs that match is at the dealership, never heard of such a thing lol.  and the fact that both NGK and AC were on the plug  oh well guess I get to spend 80 on a third of a tune up

[morfiend]

  It seems that NGK made those plugs for GM and the AC # is a parts number.

 A quick check of a couple forums was all it took to find this out.  whether or not you spend the money is up to you but I'm  sure you can find a cheaper alternate.


   

[SilverZ06]

if you only use factory why even make the post? Go get raped at the dealer. If the ngk v-powers ran fine in my Z06 and CTS-V I am sure they will be fine in your truck (btw I run them in my yukon xl also). 

[icepac]

I made a good portion of my money diagnosing cars that had a funny miss at idle.

I fixed them by putting OEM spark plugs in.

The service interval is 100,000 miles or more so that's where your savings occurs.

The reason for gapping 040 instead of 060 was instituted to ensure the vehicles made the epa mileage mandate concerning tune-up.

[Captain Virgil Hilts]

Look up the AC Delco website, they have an online catalog, you find your vehicle and then look up the parts for it.

You want an AC Delco 41-805, or if you want to use the AC Delco RpaidFire, you want a 6.

The 41-805 is $5.99 at Autozone, you'll probably have to order them for home delivery online. They have a $1.50 per plug rebate.

They have the RapidFire 6 at most stores for $4.99, no rebate.

The 41-805 is a double platinum, the 6 is not. My Firebird actually ran better with the RapidFire plugs than it did with the double platinum plugs, and they last about as long.

I prefer AC Delco plugs, or Champions, I will not use all the Bosch gimmick plugs, and rarely use NGK. I was a flat rate line tech in one of the best shops in the southeast for years. We used the factory plugs in 99% of the vehicles we worked on. We solved more problems taking the trick gimmick plugs out and throwing them away than you can count.

[gyrene81]

I made a good portion of my money diagnosing cars that had a funny miss at idle.

I fixed them by putting OEM spark plugs in.

The service interval is 100,000 miles or more so that's where your savings occurs.

The reason for gapping 040 instead of 060 was instituted to ensure the vehicles made the epa mileage mandate concerning tune-up.

i have saved a good deal of money on gas by replacing the oem plugs with bosch or ngk. i have yet to see an "economy" car get 100,000 mile plugs from the factory, gotta be luxury/performance cars with that service interval.

[icepac]

The epa demands that service interval from all cars.

[SIK1]

Real trucks don't have spark plugs. 

[lunatic1]

so I was going to change the plugs in my 2003 gmc 2500HD 6.0 pulled the plug out to get number and it has 2 numbers on it:ACDelco 12567759 and NGK pztr5a 15.  I have never seen this before but whatever, so I go to the parts store and they couldnt cross reference it over and their computer says its 2 different plugs.  Another parts store couldnt pull up either number and a napa couldnt cross it either.  So when I got home I called the dealer and he gave me: ACDelco 41805.  Under the hood lists the plugs to be gapped at .060 but the dealer told me to gap at .040.  I dont quite understand this, has anyone else had this experience?  and they are 10 dollars a whack, I changed all 6 in my blazer for 20.

i'mn a parts manager at a ford dealership the only plug we sell are motorcraft plugs-we get customers in all the time--telling us they changed their plugs 4,6,7 months ago and 80% of the time it's the aftermarket plugs they put in..so if your ride is a gm- u should stick with ac-delco--dodge--champion--ford/l/m motorcraft--etc..if thedealer is telling you use a different gap setting-maybe vehicle info has been upgraded...but if you still have your owners manual check under specifications it will tell you.if not i would use the gap setting under the hood..can't go wrong there...but people should only use the parts made by their vehicle manufacture--been a parts man for 27yrs

[Masherbrum]

so I was going to change the plugs in my 2003 gmc 2500HD 6.0 pulled the plug out to get number and it has 2 numbers on it:ACDelco 12567759 and NGK pztr5a 15.  I have never seen this before but whatever, so I go to the parts store and they couldnt cross reference it over and their computer says its 2 different plugs.  Another parts store couldnt pull up either number and a napa couldnt cross it either.  So when I got home I called the dealer and he gave me: ACDelco 41805.  Under the hood lists the plugs to be gapped at .060 but the dealer told me to gap at .040.  I dont quite understand this, has anyone else had this experience?  and they are 10 dollars a whack, I changed all 6 in my blazer for 20.

http://parts-catalog.acdelco.com/catalog/catalog_search.php

[rpm]

Real trucks don't have spark plugs. 

This.