Really wonder the reason behind its popularity in US...In China because of its price and compatibility on bumper-to-bumper Volkswagen.
Tried one interval of 0W30 on my BMW N20 engine, its longevity sucks...
Essentially the spec applies to Ford Ecoboost Turbo engines with high fuel-eco&efficiency tweak..slightly differ from 946 and more suitable for European formula.
Generally based upon API SN or A5/B5,not sure how Valvoline API SL qualifies.