DURALEC® ULTRA DIESEL MOTOR OIL
Duralec® Ultra Diesel Motor Oil combines premium base oils with Royal Purple proprietary additive technology, Synerlec®, to create a high-performance motor oil that optimizes engine performance and provides superior protection in rigorous on/off highway applications. Synerlec provides unsurpassed film strength and lubricity – up to 4X more than top competitors. In addition, advanced synthetic solvency reduces engine deposits and keeps engines clean. The net result is a better performing engine, with reduced downtime and lower cost of ownership. We recommend for use in a variety of heavy-duty applications including commuting, over-the-road trucking, agriculture, construction and mining.
Key Benefits
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Extended Oil Life
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Maximum Wear Protection
-
Reduced Oil Consumption
ADVANTAGES
- Extraordinary performance in older generation, high-output diesel engines
- Maximum wear protection – up to 33% better than CK-4 requirements
- Improved cold flow operation and start-up protection
- Extended oil life – up to 40% better than CK-4 requirements
- Reduced oil consumption
EXCEEDS INDUSTRY STANDARDS
Duralec Ultra engine oils meet/exceed performance requirements of API Service CK-4, CJ-4, CI-4+ for HD diesel engine oils.
Recommended For:
- ACEA E7-16 & E9-16
- CAT ECF-1, ECF-2 & ECF-3
- Cummins CES 20076, 20077, 20078, 20081 & 20086
- Daimler MB 228.3 & 228.31
- Detroit Diesel DFS 93K214 & 93K222
- Ford WSS-M2C171-F1
- Mack EO-N Premium Plus & EO-S 4.5
- MTU 2 & 2.1
- Renault RLD, RLD-2 & RLD-4
- Volvo VDS-3 & VDS 4.5
Available Sizes
10W-30
Available Sizes | Part Number | Item Number |
---|---|---|
55 Gal. Drum | 87456 | 301440490008 |
3 x 1 Gal. Case | 80456 | 301440490195 |
1 Gal. Bottle | 83456 |
15W-40
Available Sizes | Part Number | Item Number |
---|---|---|
3 x 1 Gal. Case | 80561 | 301902490195 |
1 Gal. Bottle | 83561 |
Duralec Super vs. Duralec Ultra vs. API CK-4

Oxidation Control Advantage
- Reduced thermal degradation and acidity
- Increased protection against sludge and deposits
- Improved additive retention
- Resistance to viscosity change
- Extended oil life and drain intervals
- Exceed oxidation stability behind warranty restrictions

Durability advantage
Exceeds maximum requirements, ensuring continued engine performance throughout operation.


FREQUENTLY ASKED QUESTIONS
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