Reviews of AC DELCO spark plug

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.

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.

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.

I initially got the P0101 code and did the obvious - replaced the MAF sensor. No change, same codes. Goodbye $100.

Plugs need to be AC Delco 41993 (no substitution). I've had misfires with other "equivalent" plugs that went away with the correct plugs.

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.

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.

Only use the factory AC-Delco 41-987 plugs.

I paid $42 for the ACDelco iridium plugs, $45 for the ACDelco pro wire set.

GM products run best with AC Delco plugs, just like Ford products run best with Motorcraft or Autolite.