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USD 25.99
Part #: RP04154

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

For All Diesel Engines - 1 Gallon Bottle
Part #: RP04154
★★★★★ ★★★★★ 7 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.

  • 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.


  • MFG. Number 4154
  • 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
  • UPC 641330431548
  • Warranty Yes
  • Warranty Info Limited
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
4.4/5 Stars out of 7 Reviews
Verified Buyer
Great price
(Colodaro) | October 16th, 2021
I ordered ( order # 1535212)royal purple for my 2015 Silverado. Great oil, And this was the best price I found. I will definitely buy from XDP again
Great oil
(Missouri) | October 8th, 2020
I really like the oil it’s makes a huge difference
(California) | April 26th, 2020
Haven't needed a chance to do an oil change yet because of the virus thing. I do like Royal Purple oil because it is considered a reference oil that others aspire to make theirs like.
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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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