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Royal Purple 85561 is the exact Duralec Ultra synthetic motor oil shown in this listing, supplied as a 5 gallon pail. Select it by the required fluid specification, viscosity, service category, component compatibility, and package quantity rather than by vehicle name alone.
Key Features
- The Duralec Ultra 15W-40 formulation in the 5-gallon pail format is designed for shop and fleet operations that service diesel trucks, commercial vehicles, and off-highway equipment where bulk purchasing reduces per-unit cost.
- The API CK-4 rating meets current API CI-4 Plus backward compatibility requirements, making the Royal Purple 85561 suitable for both new engines and older diesel platforms in the same fleet.
- The CK-4 rating specifically addresses compatibility with low-emission engine designs and their exhaust aftertreatment systems.
- API CI-4 Plus was the previous top-tier rating.
- It is suitable for use in Cummins, Detroit Diesel, Caterpillar, Mack, Volvo, and similar platforms operating on standard diesel fuel where a 15W-40 viscosity grade is specified.
- Royal Purple Duralec Ultra's full synthetic base stocks and high-performance additive chemistry are engineered to maintain lubricant integrity over extended drain intervals compared to conventional mineral or blended 15W-40 oils.
Compatibility
This is a universal specification-based product and does not receive year, make, or model fitment tags. Confirm the exact fluid specification, viscosity, service category, system capacity, material compatibility, and current manufacturer instructions before use.
Specifications
| Brand | Royal Purple |
|---|---|
| Manufacturer Part Number | 85561 |
| Product Line | Duralec Ultra |
| Product Type | Synthetic Motor Oil |
| Viscosity | 15W-40 |
| Package | 5 Gallon Pail |
| Fitment Type | Universal specification based |
| Condition | New |
What's Included
One new Royal Purple manufacturer package for part number 85561, containing 5 gallon pail. Tools, filters, service equipment, and additional fluids are not included unless expressly stated.
Brand Information
Royal Purple develops performance lubricants and vehicle fluids for street, racing, diesel, and specialty service. Product selection must follow the exact component specification and current service documentation.
Related Royal Purple Products
- Shop all Royal Purple products
- Royal Purple Duralec Ultra Diesel 10W-30 CK-4 Motor Oil - Case of 3 x 1 Gallon
- Royal Purple Duralec Ultra Diesel 10W30 CK-4 Motor Oil - 5 Gallon Pail
- Royal Purple Duralec Ultra Diesel 15W-40 CK-4 Motor Oil - Case of 3 x 1 Gallon
Frequently Asked Questions
How do I confirm Royal Purple 85561 is correct for my engine?
Match the required viscosity, service category, engine type, operating use, and current vehicle or engine-builder instructions.
Is this listing for one bottle?
No. Manufacturer part number 85561 is packaged as 5 gallon pail.
How much oil should I order?
Confirm the service-fill capacity, filter and cooler volume, expected service loss, and package quantity before ordering.
Use Instructions
Follow the current Royal Purple instructions for part number 85561 and the vehicle or component manufacturer's service procedure. Confirm compatibility, capacity, preparation, safety requirements, fill or treatment method, final level or operation checks, cleanup, storage, and disposal.
