2012 Yukon XL Spark Plugs and Wires

[gooffeyguy]

Wasn't impressed with NGK iridiums in my '01 5.3. The OEM Delco plugs lasted about 110k miles and then I swapped in the NGKs because iridium plugs were the new whiz-bang shiny new type of plug. Right at 190k, I started getting hard starts and a rough idle. Swapped the plugs, and the electrode tips were heavily eroded and virtually gone - basically looked like the tip of a tack/nail. So the NGKs barely made it 80k, and the Delco platinums lasted 37% longer.

I thought my '01 came with ACDelco iridiums? I too changed the original plugs at about 110k. Put in same kind that came out and it currently has 213k. They might've been platinum, can't remember.

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