Review on Bosch 8102 Double Platinum Longer by Michael Bryan

Check prices first with your local dealer. They offered a better base price plus a discount offer when I bought mine so keep that in mind. These are the best spark plugs for GM engines in my opinion. I used them in my 1991 Camaro and 1996 GMC Sierra when they started to skid slightly under heavy loads. These plugs restored my midrange performance and fixed the overdrive dropouts. If you use copper spark plugs in a normal ignition and misfire occurs, try them. My old spark plugs were pristine, tan, and had the correct gap (they're fine), but none of my GM engines ran right without these platinum plugs. Try them and you'll get a 6-year guarantee. Worth every penny.