I read this on Valvoline's website:
http://www.valvoline.com/faqs/motor-oil/full-synthetic-motor-oil/37 Sorry if this was posted before... I hadn't seen it on BITOG. I was shocked to see Amsoil listed on Valvoline's website!
How does SynPower compare to Mobil1 and Amsoil? Valvoline's SynPower motor oils meet and exceed the same specifications as these two products. SynPower motor oils are high performing, high-quality oils formulated with full synthetic base oils and top tier additives to provide an increased level of performance. All of Valvoline's SynPower motor oils are API licensed to ensure quality for North American vehicle application. We have specially designed SynPower 5w40 for application in high performance European or diesel passenger cars and this oil carries the specific OEM approvals such as Mercedes Benz, Volkswagen, Porsche and BMW. Our North American SynPower 5w20, 5w30 and 10w30 exceed ILSAC GF-4 requirements and carry the API starburst on the front label. SynPower is designed with extra levels of detergent and antioxidant to provide outstanding deposit and heat protection.
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