"Bought 4 of these to tune up my Escort. 1 plug failed after about a month. I have never seen a new plug fail like that. When I replaced it, the miss went away. I will be removing the others and going back to Bosch plugs. These are copper plugs and are not long lasting like the platinum or iridium types."
How often do you shop at JC Whitney.com? Multiple Times a Year
"I installed these plugs with a tune up kit with matching wires and distrutor cap on my 1995 gmc 1500.I have since put 54000 miles with no problem and the increase horse power and mileage is still going strong."
How often do you shop at JC Whitney.com? First Time
"I put these in my 06 Ram 1500 4.7L and watched my mileage increase for the first 5k and then drop to 12mpg highway for the next 10k. Thought it was just a dirty engine until I got fed up enough to change the plugs out. I switched to NGK V power and back to a consistent 18mpg on the highway. That was a year ago. Don't waste your money on these. They DONT WORK."
How often do you shop at JC Whitney.com? Once a Year