-19%
Click to zoom in
SKU: 85456 | UPC: 641330854569
Royal Purple Duralec Ultra Diesel 10W30 CK-4 Motor Oil - 5 Gallon
The Royal Purple 85456 Duralec Ultra 10W30 CK-4 Motor Oil is the best high-performance diesel engine oil for heavy-duty applications, combining premium synthetic base oils with Royal Purple's exclusive Synerlec additive technology to deliver unmatched film strength, superior protection, and reduced operating costs. Providing up to 4X the film strength of leading competitors, Duralec Ultra optimizes engine performance, minimizes wear, reduces deposits, and keeps engines cleaner in demanding on/off-highway conditions ideal for over-the-road trucking, agriculture, construction, mining, or any diesel-powered equipment requiring maximum reliability and efficiency.
Key Features
- Synerlec Additive Technology: Proprietary formula provides up to 4X stronger film strength and superior lubricity for extreme protection
- Premium Synthetic Base Oils: Advanced formulation reduces friction, improves fuel economy, and extends drain intervals
- Superior Deposit Control: Enhanced synthetic solvency keeps engines clean and prevents sludge buildup
- CK-4 Performance: Meets or exceeds API CK-4 specifications for modern low-emission diesel engines
- Heavy-Duty Versatility: Optimized for rigorous applications commuting, trucking, agriculture, construction, and mining
- 5-Gallon Pail: Convenient bulk size for fleet maintenance, shops, or frequent oil changes
Specifications
| Specification | Detail |
|---|---|
| Part Number | 85456 |
| Viscosity | 10W-30 |
| API Rating | CK-4 |
| Size | 5 Gallon Pail |
| Base Oil | Premium Synthetic |
| Additive Technology | Synerlec (Royal Purple Proprietary) |
| Applications | Heavy-Duty Diesel Engines (On/Off-Highway) |
| Country of Origin | United States |
| Warranty | Limited (Royal Purple) |
| Shipping Weight | Approx. 38-40 lbs (5 Gallon) |
Product Notes
- 5-gallon pail – convenient for fleet, shop, or frequent use in diesel trucks/equipment
- Superior protection in extreme conditions reduces downtime and lowers cost of ownership
- Recommended for diesel engines requiring CK-4 performance check OEM specs for compatibility
Installation Notes
- Estimated time: Standard oil change drain old oil, replace filter, fill with Duralec Ultra
- Use proper fill amount per vehicle specs check dipstick for accurate level
- Professional oil change recommended ensure proper disposal of old oil
This Part Fits
| Application | Notes |
|---|---|
| Heavy-Duty Diesel Engines | Over-the-Road Trucking, Agriculture, Construction, Mining, Commercial Fleets |
| Common | Ford Power Stroke, GM Duramax, Ram Cummins, Caterpillar, Cummins, Detroit Diesel (CK-4 Approved) |
Why Choose Royal Purple Duralec Ultra 10W30 CK-4?
- Synerlec technology provides up to 4X film strength for maximum engine protection and reduced wear
- Premium synthetic base oils extend drain intervals, improve fuel economy, and keep engines clean
- Limited warranty trusted heavy-duty diesel oil from Royal Purple, leader in performance lubricants
Frequently Asked Questions
-
Q: Is this oil suitable for my 2020 Ram 2500 Cummins?
A: Yes, Royal Purple Duralec Ultra 10W30 CK-4 meets or exceeds CK-4 specs for modern diesel engines including Cummins. -
Q: Can I extend drain intervals?
A: Yes superior synthetic formulation often allows extended drains; follow OEM or oil analysis recommendations. -
Q: Does it reduce engine noise?
A: High lubricity and film strength often result in quieter operation and smoother performance. -
Q: What is the warranty?
A: Covered by Royal Purple limited warranty trusted for heavy-duty applications.
Shipping & Handling
- Method: UPS/FedEx Ground (Hazardous Material – Oil)
- Availability: In stock - ships same or next business day
- Packaging: Secure protective packaging
- Weight: Approx. 38-40 lbs (5 Gallon)
Engine
Engine parts and engine bay upgrades for Dodge, Jeep, RAM, Chrysler, Chevrolet, Ford, Toyota, Nissan, Subaru, and Honda vehicles are stocked at Black Ops Auto Works. Shop oil catch cans, supercharger pulleys, thermostats, radiators, cooling parts, throttle bodies, intake manifolds, headers, ignition coils, spark plugs, sensors, gaskets, fuel pumps, valve covers, engine covers, billet cap covers, and full engine bay dress-up parts for HEMI, Hellcat, Trackhawk, Redeye, Demon, Scat Pack, RAM TRX, LS, LT, Coyote, EcoBoost, K-Series, and 2JZ builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 14,298 engine SKUs across performance, cooling, oil control, ignition, and appearance categories. What This Category Covers The Engine collection combines OEM-replacement engine service parts with performance aftermarket upgrades for supercharged, turbocharged, and naturally aspirated builds...
View Engine Products
Motor Oil
Motor oil for cars, trucks, SUVs, motorcycles, and diesel platforms is stocked at Black Ops Auto Works. Shop full synthetic, high mileage, break-in, racing, and diesel-rated motor oils in quarts, gallons, 5 gallon pails, and bulk bag-in-box sizes for daily drivers, boosted performance builds, and fresh engine break-in. Every product is filterable by viscosity, formulation, and package size so the correct oil ships the first time. Black Ops Auto Works carries 311 motor oil SKUs across synthetic, diesel, racing, and break-in formulations. What This Category Covers The Motor Oil collection spans daily-driver synthetic oils, diesel-rated heavy duty oils, motorcycle oils, dedicated break-in oil for fresh engine builds, and racing oils formulated for high RPM and high heat. Viscosities range from 0W20 and 5W20 for modern fuel-efficient engines up to 20W50 and straight SAE 50 for older, high performance, and track applications. Categories Included Full synthetic motor oil, synthetic bl...
View Motor Oil Products
Oil Systems
Oil system parts for supercharged HEMI, LS and LT platforms, diesel trucks, and daily drivers are stocked at Black Ops Auto Works. Shop oil catch cans, air oil separators, oil filters, oil pans, oil pumps, oil pickups, dipsticks, drain plugs, and motor oils for Hellcat, Redeye, Demon, Jeep Trackhawk, Ram TRX, Corvette, Camaro, CTS-V, Mustang, F-150, and Silverado applications. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 1,432 oil system SKUs across catch cans, filtration, and service hardware. What This Category Covers Oil system parts manage crankcase ventilation, filtration, and lubrication delivery throughout the engine. This collection spans oil catch cans, oil separators, air oil separators, oil filters, oil pans, oil pumps, oil pickups, dipsticks, drain plugs, oil baffles, and motor oils for street, track, towing, and high horsepower applications. Crankcase Ventilation...
View Oil Systems Products