|
I always try to use OEM when I can, because as Ted said there is a lot more time and testing going into that than most of the aftermarket.
However there are times when the OEM components do not have the right specs to meet what you are trying to do with it. Also remember GM has a much different set of goals to meet. They have to meet not only what they want to build but CAFE, CARB, NHTSA, Warranty, a 18 year old to a 78 year old.
With that wide of a range of goals, and their suggested 100,000 miles between plug changes, don't expect it to carry over onto every aftermarket build.
For example...I couldn't use that in the race car, they simply do not meet the heat, firing, and spark needed for any of our endurance cars. Of course we may go through plugs every 12-24 hrs of run time as well.
There is a lot of fine tuning that can be done with plugs, if a OEM plug fits the build you will most certainly get a lot of life out of it. If not then sometimes you have to go back to a traditional copper based plug...just don't expect them to last 25k+ miles.
|