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USD 28.99
Part #: RP04154

Royal Purple 15W-40 Duralec Super Synthetic CK-4 Engine Oil 04154

Vehicle Fitment:
For All Diesel Engines - 1 Gallon Bottle
Part #: RP04154
★★★★★ ★★★★★ 17 Reviews
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Get a an API CK-4 engine oil when you purchase Royal Purple 15W-40 Duralec Super Synthetic Engine Oil 04154. The specially created formula found in Duralec Super motor oil delivers incredibly resistance to high temperatures and low temperature pumpability. Specifically formulated to maximize component life, Duralec Super motor oil extends drain intervals and improve fuel performance.

High performance engine oil, Royal Purple Duralec Super motor oil is created for emission-controlled diesel engines utilizing emissions equipment such as: DPF’s, Catalytic Converters, EGR, and SCR injection. Duralec Super motor oil also provides upgraded rust and corrosion protection, outstanding soot dispersancy and prevention of varnish and sludge formation.

Greater Wear Protection:
Duralec Super's advanced additive technologies form a tough, tenacious film on all metal surfaces providing superior engine wear protection.

Greatly Extends Oil Drain Intervals:
Duralec Super Motor Oil is extremely oxidation stable and stands up to the heat that causes oils to thicken, form lacquer and varnish deposits, lose its lubricity and shorten the life of both the oil and the engine.

Superior Corrosion Protection:

Duraiec Super's advanced additive technologies protect during normal and Severe operation and act as preservative oil during shut-down, which protects initial startup.

Reduces Exhaust Emissions:

Duralec Super Motor OiJ provides a superior seal between the piston ring and cylinder wall, which reduces blow-by, improves combustion efficiency and reduces harmful emissions.

Keeps Engines Clean:
Duralec Super Motor Oil's natural solvency cleans deposits left by old oils and keeps engines clean.

API Warranty Compliant:
Duralec Super's SAE grade motor oils are API licensed. They are compatible with other mineral and synthetic motor oils. Switching is easy. Drain the old oil. Change the filter. Add Duralec Super Motor Oil. Follow the manufacturer's recommended drain intervals during warranty. Will Not Harm Seals Duralec Super Motor Oil has the same excellent seal compatibility as mineral engine oils.

  • Will Not Harm Seals
  • Keeps Engines Clean
  • Greater Wear Protection
  • Reduces Exhaust Emissions
  • Superior Corrosion Protection
  • Greatly Extends Oil Drain Intervals
  • API-Licensed CK-4 Diesel Motor Oils

Application Notes:
Allow 8,000 to 10,000 miles before use in diesel engines.
Royal Purple's motor oils are API certified and will not void new car warranties.

OEM Recommendations:
Royal Purple Duralec Super API CK-4 should be considered where the following OEM specifications are recommended:
Caterpillar ECF-3
Cummins CES 20086
Detroit Diesel DFS 93K222
DeutzDQC 111-1 OLA
Mack EO-S -4.5
MB 228.31
Volvo VDS-4.5
Royal Purple Duralec Super 15W-40 API CK-4 can also be used in older diesel engines, including off-highway engines still using the 500 ppm sulfur diesel fuels.


  • MPN 4154
  • SKU RP04154
  • GTIN 641330431548
  • ID 395
  • Manufacturer Name Royal Purple, Ltd.
  • Shipping Weight 5.00 lb.
  • Shipping Length 5 in.
  • Shipping Width 9 in.
  • Shipping Height 9 in.
  • Fuel Type Diesel
  • Warranty Info Limited
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L100R163


★★★★★ ★★★★★
4.8/5 Stars out of 17 Reviews
Verified Buyer
Royal Purple Purchase
I was very pleased with the prompt service and pricing. I researched and shopped around and your pricing was the lowest I found. I will use you for purchasing this product again.
Verified Buyer
Fast shipping and good prices
Came quick and at a good price.
Verified Buyer
Great Price/Great Oil
I run Royal Purple in most all of my vehicles and have never had any issues. Pricewise, it's a great value!
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Questions and Answers

What is the recommended change interval?
View Staff Answer 


Royal Purple suggests adhering to manufacturer’s recommended oil change intervals for vehicles under warranty. For vehicles outside the OEM warranty, please see the recommendations below.

Diesel pick-up trucks and passenger cars with an oil capacity of 10 or more quarts:

For vehicles for which OEM warranty is not a concern, drain intervals can be extended up to 15,000 miles (24,000 km) or 12 months, whichever occurs first using Royal Purple SAE 15W-40 or HPS engine oils.

Passenger cars, light trucks and vans:

For vehicles for which OEM warranty is not a concern, drain intervals can be extended up to 12,000 miles (20,000 km) or 12 months, whichever occurs first, using Royal Purple SAE 15W-40. An extended interval of up to 15,000 miles (24,000 km) or 12 months, whichever occurs first, is recommended when using Royal Purple HPS oils.

The extended drain intervals provided above apply primarily to street-driven, mechanically sound vehicles. For guidelines specific to your vehicle, we recommend contacting the Royal Purple Automotive Technical Department.

I have a 2003 Duramax with 100000 miles. Can I use this product?
View Staff Answer 

Yes. Mileage and/or age is not a factor when used in a mechanically sound engine. In high-mileage applications, we do recommend running a minimum of two short (3,000 mile/5,000Km) intervals before extending the oil drain intervals. This will enable Royal Purple’s high solvency to remove existing deposits gradually; such deposits can restrict oil flow, if excessive, as well as reduce the oil service life significantly.

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