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Review on πŸ”₯ High-Performance Iridium Spark Plugs (OE12621258) - Pack of 8 for Chevy, GMC, Cadillac, Buick, Hummer, Isuzu, Pontiac, Saab by Justin Peck

Revainrating 1 out of 5

2009 GMC Sierra 4.8L

I just replaced them with Delco quick spark plugs after about 1000 miles and will never put them in my car again. My gas mileage has gone from 17mph to 13, it's just junk plugs for my engine. It might work for you, but certainly not for me.

Pros
  • Confident
Cons
  • Could have chosen a newer model