Originally Posted By: Garak
Originally Posted By: dlundblad
More specifically, why no 10w30s?
Or monogrades, or 20w-20s, right?
PQIA has done 10W-30s and straight 30s.
Focus is placed on the largest selling grades, and often presented in grade themes, e.g. a set of 5W-30s or a set of 5W-20s. Less common grades will have their turn again.