Formulated with patented friction modifier system, SAE 5W-30 UltraFleet® API-CJ4 Synthetic Heavy Duty Diesel Motor Oil minimizes internal drag within engines, resulting in maximum engine power output. Product was found to deliver average fuel economy improvement of 3.3% and up to 4.5% over conventional SAE 15W-40 API CJ-4 lubricant tested at independent facility using SAE J1321 fuel test protocol.
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