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.
Cons: engine run rough
Reviews of AC DELCO spark plug
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I have a 2010 Silverado, and I had a 2011 Silverado. Go with the Delco's. It what your truck was built with, it what she will run best with.
If you do go with something else. Stick with a denso, or an NGK. Avoid Bosch plugs in that truck like the plague or you will start tripping codes.
Pros: runs best with Delco
Cons: avoid Bosch plugs
Vehicle:
Chevrolet Silverado
41-156 is the new plug for the LE2 engine. Our 2016.5 got them, and they are fine. 41-123s came out of it.
Pros: they are fine
Vehicle:
Chevrolet Cruze
Part number: 41-156
I initially got the P0101 code and did the obvious - replaced the MAF sensor. No change, same codes. Goodbye $100.
Cons: no change, same codes
Plugs need to be AC Delco 41993 (no substitution). I've had misfires with other "equivalent" plugs that went away with the correct plugs.
Pros: correct plugs fixed misfires
Cons: other plugs caused misfires
Part number: 41993
I have a 1986 blazer and replaced the spark plugs with ac delco factory spark plugs purchased from napa, about 2 months later I was driving the vehicle and the vehicle had a miss then starting blowing out oil from the Pcv vlave from excessively high crank case pressure after electrode fell out.
Pros: factory spark plugs
Cons: electrode fell out
Vehicle:
Chevrolet Blazer
I bought six ac delco spark plugs from Rockauto and half were made in France and half were made in the US. There are very slight differences like the diameter of the electrode and how deep the plug is on the end that goes into the cylinder. Even one of the US plugs is different from the other two.
Cons: slight differences in plugs
Only use the factory AC-Delco 41-987 plugs.
Pros: factory quality
Part number: 41-987
I paid $42 for the ACDelco iridium plugs, $45 for the ACDelco pro wire set.
Pros: iridium plugs, pro wire
GM products run best with AC Delco plugs, just like Ford products run best with Motorcraft or Autolite.
Pros: best performance
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