[mwebb]

i fix broken cars
do a lot of misfire related testing , i have never seen Bosch platinum +4 s installed in a car that functions as claimed by bosch
and
this is all over the forums - join IATn and read in the archives

so for your claims and alleged results
you are unique

the rest of the mortals that drive cars should NEVER use Bosch Platinum+4s imho , they should use the OEM recommended spark plug for best results and the least problems with misfires and subsequent cat failures

Originally Posted by hpfr33k

Its a self indexing plug, gives you the absolute best burn because the spark hits where its needed, you are right tho, they usually are the wrong gap, but for the last 60k miles, I've never had a problem, and just did a similar tune up to my 01 grand am, and Its averaging 35-38 mpg. Thats 10-13 above the gov rating, they do help mpg alot. Just saying between the 5 vehicles in my fam that I up keep, and the 390 miles driven daily between us, never had engine trouble. Facts speak louder than books.