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  1. Oil Categories - API

  2. Motor Oil Guide - API

  3. API Engine Oil Lubricant Specifications - oilspecifications.org

  4. Motor Oil Grades and Classifications Explained

  5. Engine Oil Comparison Chart: Ultimate Guide to Best Picks

  6. Oil Service Classifications and Oil Grades - Select Synthetics

  7. Synthetic Oil Comparison Chart: Ultimate Buyer’s Guide

  8. Motor Oil Grades and Their Impact on Engine Performance