Royal Purple® HD Motor Oil is specifically formulated to maximize performance and meet the demands of heavy-duty engines. Many older heavy-duty engines, and some newer commercial and stationary engines recommend the use of heavy-duty engine oil with a high level of anti-wear additive (ZDDP), and heavier viscosity grades. HD Motor Oil is fortified with a high level of zinc/phosphorus anti-wear additive and a generous dose Synerlec®. Synerlec® is Royal Purple’s proprietary additive chemistry that greatly increases the protective film strength of the oil, reducing metal to metal contact, friction and wear. Synerlec® also increases the oil’s resistance to thermal degradation, reducing deposit formation and lengthening the oil’s useful life reducing maintenance costs.

HD Motor Oil reduces parasitic loss compared to other straight grade HD engine oils, saving fuel, and its synthetic solvency keeps internal engine parts cleaner than detergents alone. HD motor oil is recommended for use in gasoline and diesel applications including automotive, commercial fleet and stationary industrial engines that need a high anti-wear additive, Heavy Duty engine oil. Royal Purple HD Motor Oils may also be used in transmissions and gear boxes that specify the use of SAE 30, SAE 40, SAE 50 or SAE 15W-40 engine oil.


  • UNSURPASSED WEAR PROTECTION – Elevated anti-wear additive and Synerlec® additive technology prevents wear of piston rings, valve train, and other components beyond licensed HD diesel engine oils
  • OUTSTANDING OXIDATION RESISTANCE – Less thermal breakdown allows longer oil drain intervals
  • INCREASED EFFICIENCY – Synthetic base oils and Synerlec® additive technology reduce parasitic loss, increasing fuel economy
  • OUTSTANDING DEPOSIT CONTROL – Keeps engines cleaner, ensuring maximum performance
  • SUPERIOR CORROSION PROTECTION – No rust observed in standard industry testing

Available Sizes

SAE 30

Available SizesPart NumberItem Number
1-Qt Bottle06030301149175115

SAE 40

Available SizesPart NumberItem Number
1-Qt Bottle06040301905175115

SAE 50

Available SizesPart NumberItem Number
1-Qt Bottle06050301444175115

SAE 15W-40

Available SizesPart NumberItem Number
320 Gal Tote11565301902175322
1-Gal Bottle11561301902175180


PDS HD Motor Oil SDS HD Motor Oil
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