American Petroleum Institute (API) recently revised its Oil Matters Guide to include API SN with SN PLUS. API-licensed oil marketers should have received the latest version with their 2018 API licenses, but some might have left the unopened package in their inboxes. The revised guide provides important information about the API marks and current API and International Lubricant Specification Advisory Committee (ILSAC) oil standards that all oil marketers should know by heart.
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