Originally Posted By: FordCapriDriver
Valvoline VR1 Outdated? aren't most versions of VR1 API SM? ridiculous
10w30 VR1 is SH due to the high zddp content. SH is an obsolete spec. But VR1 is a modern formulation, it just has zddp content above any current spec.
20w50 VR1 is SM because 40 weight and higher don't have zddp limits in API specifications.
Valvoline VR1 Outdated? aren't most versions of VR1 API SM? ridiculous
10w30 VR1 is SH due to the high zddp content. SH is an obsolete spec. But VR1 is a modern formulation, it just has zddp content above any current spec.
20w50 VR1 is SM because 40 weight and higher don't have zddp limits in API specifications.