Bought some for my 99 SE....3100....
AC Delco # 41-940....stock
Question....
Is # 41-932, 1 colder?
41-975, 1.5 colder?
and 41-913, 2 colder?
Also, will running a colder plug in my SE make any type of difference? Stick with the stock ones I have?
Just a question I had.