Originally Posted By: Garak
Agreed. One of my favorites, MaxLife, has the certification. A lot of the others, notably SOPUS products, don't, and I was surprised, in a good way. Perhaps it's a way for some cheap, extra ZDDP for the old truck instead of hunting for obscure grades of HDEO conventional.
I think the best HM oil option has the outdated SL api cert AND the energy conserving ISLAC cert. Thats how you get more zddp and more friction modifiers. Supertech and Mobil 1 used to have it.