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Mobil 1, Royal Purple and Motul are three of the best-known names in synthetic motor oil, and they sell very different kinds of oil under similar-looking labels. One is a mainstream daily-driver oil built around the approvals modern engines ask for, one leans toward enthusiasts and older performance engines, and one is known for European-car and racing lines. The right pick starts with what your owner's manual requires, not with the logo. The sho …