Spark plugs

[TahoeLTZ2007]

Guess I better stick with the oem delcos.
Thanks Guys

 

[gooffeyguy]

I run NGKs that are 2 heat ranges colder in my supercharged 5.0 mustang, but run stock AC Delco iridium in my trucks

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[kbuskill]

NGK apparently makes the AC Delco iridium plugs now so probably no real difference.

 

[Derick]

NGK apparently makes the AC Delco iridium plugs now so probably no real difference.

Source?

It wouldnt surprise me. NGK dealt with iridium early in the game because of them ***-o-neese ve-hicles I referenced. They kinda started using that tech earlier than the murican brands.

 

[kbuskill]

Source?

It wouldnt surprise me. NGK dealt with iridium early in the game because of them ***-o-neese ve-hicles I referenced. They kinda started using that tech earlier than the murican brands.

I had read it on here before and researched it back then and found some pretty convincing sources, although I can't recall at the moment where I read it.

However a quick search turned up this photo...

If you look closely you will see NGK stamped into the metal.

NGK may not make all of the plugs for Delco but it's a pretty safe bet that they do.

Also there is this...

When I ordered my AC Delco air conditioning compressor, it came in a Delco box, and said "made in USA" on the box, yet it was a Denso compressor and it said "Made in Japan" on the compressor. But it was EXACTLY the same the the original that I removed from my truck. My OEM compressor was a Denso compressor. So I should have saved a few bucks and just bought a Denso compressor instead of the AC Delco, because it's the SAME DAMN THING!!!
Another time, I bought AC Delco spark plugs that said NGK on the plugs. Also, AC Delco belt tensioners are actually made by Gates. So save the money and just buy a Gates tensioner.

AC Delco is just a name since GM went to Delphi. Like any business they source parts from the cheapest source to try to turn the biggest profit.

 

[Jack Hammer]

Any suggestions on double platinum vs iridium spark plugs for our 5.3L's? I can't find the OE recommendation in the PDF owners manual I have nor the AutoMATE online reference through my local library...

Greetings I installed a set of E3 spark plugs in my 05 Yukon Xl 4 wheel drive. The gas mileage increased by 2 mpg on the freeway.

 

[SnowDrifter]

Greetings I installed a set of E3 spark plugs in my 05 Yukon Xl 4 wheel drive. The gas mileage increased by 2 mpg on the freeway.

Go shill somewhere else and take your garbage ass plugs with you