Best Spark plugs

[1low1]

So I've got my new (used) truck roadworthy and am now ready for a good tune. My question is what are the best plugs to be using in my 2003 silverado 2500hd with 6l . should I be using stock recommended plugs or? Fuel mileage is also a concern so any tips on helping with that would also be appreciated.

[dr.gizmo]

Use only the factory plug recommended by GM.

[MrCritical]

Be sure the fuel filter is clean.

The best thing you can do for fuel mileage on the 6 liter is to take off easy and set the cruise at the speed limit on the highway or about 5 mph back.

[F14CRAZY]

I'd just stick with Delcos. Don't buy into the hype of double platinum electrodes, etc

[RamJet502]

I've heard really good things about NGK TR55 spark plugs on the 5.3L and 6.0L

[Shotgun]

Champion makes some great plugs, also. Had good luck and heard good things about them. Not much on Autolite, though.

[boston boy]

AC/Delco for GM cars/trucks, but this is me

[Mustapha Mond]

Use only the factory plug recommended by GM.

x2
My ride is too important to trust to just anyone.

[Ed753]

This guy always has pretty good prices on plugs.

http://www.sparkplugs.com/results_ap...1&AAIA=1412132

Double Platinum or Iridium with Platinum ground will last about 100K miles, single Iridium or single platinum will last about 50-60K miles.

Ever since GM spun-off Delphi, and since Delphi stopped making plugs, ACDelco's could be anything in the box..... Autolite, Champion, Denso or NGK, they are all tested and validated as suitable.

[voyager]

I'll take the ones he's using ;-)

[1low1]

Only use AC/Delco Iridiums or Denso Iridiums...as ACD plugs for that are made by Denso...


ACD# 41-110/oe#12621258

Do you or anybody else know if there are different part #'s for plugs in Canada? I called a part store today with the #'s above but their computer shows nothing and lists a completely different delco # for my truck? I could easily find the above #'s on ebay, but not here?!

[old geezer]

I believe 41-110 replaced this #

Document ID# 1396703


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Subject: Information on New Spark Plugs and Gapping #03-06-04-060 - (10/24/2003)



Models: 2004 Buick Ranier

2002-2004 Cadillac Escalade, Escalade EXT

2003-2004 Cadillac Escalade ESV

2004 Cadillac CTS-V

1997-2004 Chevrolet Corvette

1998-2002 Chevrolet Camaro

1999-2004 Chevrolet Silverado

2000-2004 Chevrolet Suburban, Tahoe

2002-2004 Chevrolet Avalanche

2003-2004 Chevrolet Express, TrailBlazer

1999-2004 GMC Sierra

2000-2004 GMC Yukon, Yukon XL

2001-2004 GMC Yukon Denali, Yukon XL Denali

2002-2004 GMC Sierra Denali

2003-2004 GMC Envoy XL

1998-2002 Pontiac Firebird

2004 Pontiac GTO

2003-2004 Hummer H2

with 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U -- RPOs LR4, LM4, LM7, L59, LS1, LS6, LQ9, LQ4)




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A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. Any new spark plug found to not be properly gapped should not be used.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


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Document ID# 1396703

[Ed753]

Good point!

I heard from an ACD rep just today, most ACD plugs of recent are from Denso

That is a rather generic statement, production or service?

Since ACDelco is "All Makes" it sells plugs, GM never had for new car production.

I know Autolite and Champion are making a lot of their plugs, is the only reason, I'm being so critical.

Furthermore, I know NGK did have a lot of the ACDelco business too, not sure what they have currently, but I can't imagine they lost all of it.

[Chris_6]

AIR the new 41-101's i installed in my G6 last week are made by NGK.

[Ed753]

Again, I'm put to the test!!! LOL!

Service iridium to be exact, hence my statements to the original poster for his application.... I inquired about Champions...not so, often confused with Champ filtering...but then...I don't claim to be an expert @ anything!

If you could provide some evidence of such rather than my heretical sources...I'm all for it...as we are about "inside news" here....and lately I'm very "outside" the loop!!! LOL!!!

I hope to hell the ACD iridiums I put in my Park Avenue aren't crappy Autolites or Champions...as out they'll come!!!!!! Might as well put in Motorcraft!!! LOL! They were # 12568387/41-101 with Blue writing...

Yes, Champion Filters, or "Champ" is part of Champ Labs, then there is Champion Chemicals, and Champion Homes (mobile & modular homes) they are all different compainies, as is Champion Spark Plugs, which is part of Federal-Mogul, since 1998. If your still not confused, the "AC" in ACDelco was Albert C. Champion the spark plug inventor himeself.......

Sorry I digress, I've worked at ACDelco, NGK and Champion. Since Delphi is out of the plug business, no plug is really an ACDelco anymore.......

Denso and NGK were the early winners, and fairly recently Autolite started making a lot of the ACDelco service plugs, but they just lost a bunch of that business to Champion, that is what I know.