Owner reviews for spark plug

The NGK's worked beautifuly.

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.

I used NGK, 6 month no issues.

Get NGK plugs instead...mine have been working great.

I'm currently is20 United 91 octane tune, APR packs and NGK RS7 plugs (one step colder thant oem), gapped at around 0,028'' and car feels solid. No misfire, no EPC. However it honestly feels just like when I was with oem coilpacks and plugs. Maybe now idle feels a little bit smoother.

I’m now running factory heat range NGK 94833 plugs gapped at 0.03 and the car runs so much cleaner.

And also removed and cleaned my spark plugs. All these collectively seemed to have a great impact on the engine\u2019s performance! The engine runs much smoother and feels a lot more sporty!

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.

I've heard for many decades how bad Bosch spark plugs are and I figured the coils would be just as bad, if not worse.

Bosch spark plugs are junk.