Spark plug NGK or AC DELCO

Have used NGK on every vehicle I've ever owned. They've often lasted the life of the vehicle.

ive put about 15k on a stock gapped set, no issues APR IS20 87 tuned,

You will be fine if you go with them. Like others have said it's a solid plug and no issues so far with mine.

I run them. They are a good plug.

They are great. Also around 12k miles on mine - no issues.

Yeah I've had these on my 2010 for about 12k miles now. No issues, have been performing just fine.

I used NGK at 100k miles and have been happy with them.

Skip the genuine spark plugs and just get NGKs. And skip the genuine oil change kit and get pentosin if you wanna stay oe

The new plug is AC Delco 41-156. Cannot tell any difference in my Gen 2 after replacing plugs. It ran fine before and did afterwards as well.

My 6.0 never ran right unless I used AC Delco. And specifically whatever the current equivalent part number is to what the manual says.