Royal Purple Duralec Super 15W-40 Diesel Motor Oil, Diesel Vehicles, 7.7 lbs, 1 Gallon
Royal Purple Duralec Super 15W-40 Diesel Motor Oil, Diesel Vehicles, 7.7 lbs, 1 Gallon
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Royal Purple Duralec Super 15W-40 Diesel Motor Oil, Diesel Vehicles, 7.7 lbs, 1 Gallon

Royal Purple Duralec Super 15W-40 Diesel Motor Oil, Diesel Vehicles, 7.7 lbs, 1 GallonRoyal Purple Duralec Super 15W 40 Diesel Motor Oil Diesel Vehicles 7 7 lbs 1 Gallon2 pack Royal Purple Duralec Super 15W 40 Diesel Motor Oil Diesel Vehicles 7 7 lbs 1 Gallon5 pack Royal Purple Duralec Super 15W 40 Diesel Motor Oil Diesel Vehicles 7 7 lbs 1 Gallon4 pack Royal Purple Duralec Super 15W 40 Diesel Motor Oil Diesel Vehicles 7 7 lbs 1 Gallon3 pack Royal Purple Duralec Super 15W 40 Diesel Motor Oil Diesel Vehicles 7 7 lbs 1 Gallon
Pack Size:Single
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Key item features

  • Enhanced Protection: Provides greater wear and superior corrosion protection for diesel engines.
  • Extended Intervals: Greatly extends oil drain intervals, reducing maintenance frequency.
  • Emission Reduction: Reduces exhaust emissions, contributing to a cleaner environment.
  • Engine Cleanliness: Keeps engines clean, ensuring optimal performance.
  • API-Licensed: API-licensed CK-4 diesel motor oil, suitable for modern diesel engines.
  • Seal Safe: Will not harm seals, ensuring compatibility with engine components.
  • High Performance: Resists high-temperature breakdown and performs well in low temperatures to reduce startup wear.
  • Product Specifications: 1 gallon net content, weighing 7.7 lbs, designed for diesel vehicles.
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Current price is Now $29.98
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was $35.99
23.4 ¢/fl oz
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Customer ratings & reviews

4.8 out of 5 stars
stars80 ratings33 reviews
How item rating is calculated
  1. 5 stars91% (73)
  2. 4 stars4% (3)
  3. 3 stars3% (2)
  4. 2 stars0% (0)
  5. 1 star3% (2)

Reviews summary

Pros

  • : Offers affordable prices with fast delivery.
  • : Provides durability in engines.
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Showing 1-3 of 33 reviews

Jun 21, 2025
dJ01
Item details
Multipack quantity: 1
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

best oil

Good stuff and good price with fast delivery.

Helpful?1DPQQP3H6MG535513143
May 23, 2026
randall
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

best oil for my diesel varriew 4lbs more oil pressure than amsoil.

Helpful?1DPQQP3H6MG535513143
Jul 16, 2016
Sunshine
5 out of 5 stars review

Verified Purchase

Happy

I have used this product for several years now and am very pleased with it's performance. I had been using another high quality synthetic motor oil for a long time and while it worked well Royal Purple exceeds it. With Royal Purple the diesel engine in my 2001 Ford runs quieter and usage is practically zero. What got me to first try Royal Purple was the price from Walmart but I'm sold on it now no matter the price. I'm just now switching over to their Max Tane injector cleaner.

Helpful?1DPQQP3H6MG535513143