Commercial Lubricant Product Line

Fortified with a high level of zinc/phosphorus anti-wear additive and Royal Purple’s proprietary additive technology Synerlec®, Duralec™ Ultra™ is formulated to maximize performance and meet the demands of today’s heavy-duty engines. It is recommended for use in both two-cycle and four-cycle diesel applications including automotive, commercial fleet and stationary industrial diesel engines. Duralec Ultra provides a lower coefficient of friction to save fuel, and its synthetic solvency keeps internal engine parts cleaner than detergents alone. Duralec Ultra also provides superior oxidation stability that greatly extends drain intervals and minimizes harmful oil degradation.

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