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USD 28.34
Part #: RP83561

Royal Purple 15W-40 Duralec Ultra Synthetic Engine Oil 83561

For All Diesel Engines - 1 Gallon Bottle
Part #: RP83561
★★★★★ ★★★★★ 1 Reviews
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Keep your engine performing at its best when you add Royal Purple 15W-40 Duralec Ultra Synthetic Engine Oil 83561. Duralec Ultra features a Royal Purple’s proprietary Synerlec additive technology and is fortified with a high level of zinc/phosphorus anti-wear additive. Designed to provide improved film strength and superior protection, Synerlec bonds perfectly with metal surfaces and prevents metal-to-metal contact. 

Recommended for use in both two-cycle and four-cycle diesel applications including automotive, commercial fleet and stationary industrial diesel engines, Duralec Ultra extends drain intervals and minimizes oil degradation. Very resistant to oxidation, Duralec Ultra synthetic solvency keeps internal engine parts cleaner than detergents alone. 

  • Keeps Engines Clean
  • Extends Drain Intervals
  • Greater Wear Protection
  • Minimizes Oil Degradation
  • Superior Corrosion Protection


  • MFG. Number 83561
  • Manufacturer Name Royal Purple, Ltd.
  • Shipping Weight 8.00 lb.
  • Shipping Length 8.25 in.
  • Shipping Width 5 in.
  • Shipping Height 8.5 in.
  • Fuel Type Diesel
  • UPC 641330835612
  • Warranty Yes
  • Warranty Info Limited
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
5.0/5 Stars out of 1 Reviews
Royal Purple 15w40
(CA) | July 6th, 2020
Great product. Delivered in just a few days, very fast.

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XDP continues to closely monitor the COVID-19 (Coronavirus) outbreak. As an integral part of the automotive supply chain, at this point all call centers and distribution centers remain fully operational to ensure we keep vital service components flowing to vehicles used in transport of goods and emergency response. To ensure the health of our employees, families, and customers, we have made the following procedural changes:

  • UPDATE: Effective 6/1 Customer Service resumes normal business hours of M-F 8:30 – 9:00pm EST.
  • Effective 3/18 we have decided to temporarily close both of our retail stores in NJ and NV.
  • Our technical sales team remains available Mon-Fri 8:30am-9pm and Saturday 10:30am-7pm EST.
  • All employees have been encouraged to follow the CDC's recommendations at home and in the workplace.
The circumstances of this virus are fast moving, as such, we will continue to update you with any further operational adjustments as needed. As always, we value your business and appreciate your patience as we manage this situation together.