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What is the Best Diesel Oil for Diesel Engines?

Proper maintenance of your diesel engine can greatly prolong the life of your vehicle. You may ask yourself, what is the best motor oil for diesel engines? Not all motor oils are equal, and choosing the best motor oil for diesel engines can help your diesel engine last longer, as well as have the oil itself last longer, helping you avoid endless oil changes.

The first thing you need to decide is whether you want to use synthetic or traditional oil. Traditional oil is made from natural mineral oil and often has some impurities. Synthetic oil is a manufactured product that replicates natural oil, yet has no impurities, is more consistent, and often has additives to improve performance and longevity. Synthetic oil is more expensive than natural oil, which is it’s only downside. If you want the best motor oil for your diesel engine, synthetic is always the best choice for the health and safety of your engine. 

You will also always want to ensure you use a motor oil that is made for diesel engines. Motor oil for diesels have different additives that are meant to improve the longevity and performance of diesel engines, and oil for diesel engines also has a higher viscosity. 

Best Diesel-Specific Motor Oils


Mobil 1 5W-40 Turbo Diesel Truck Motor Oil or Mobil Super 96819 15W-40 Delvac 1300 Motor Oil

Mobil’s brand of diesel-specific synthetic motor oils are some of the best available, plus they’re easy to find. Mobil motor oil deals really well in low temperatures, making it an ideal choice for Albertans. Mobil motor oil protects, lubricates, and boosts engine performance, and it also serves to prevent leaks. Mobil oil is a great way to boost performance while increasing longevity. You also don’t need to worry about changing your oil as often, as the fully synthetic formula blocks buildup that could harm your engine. Mobil diesel-specific motor oil is a fantastic choice for all diesel engines, the only downside is that you can only buy Mobil in gallons, making it a little more difficult to measure out as you’re changing your oil.

Royal Purple

Royal Purple 04154 API-Licensed SAE 15W-40 High Performance Synthetic Motor Oil

Royal Purple combines proprietary additives with premium base oils, creating a highly effective and protective oil. Royal Purple gives users enhanced performance capabilities while also working to optimize fuel efficiency, making it a great choice for daily drivers. Royal Purple motor oil is also very easy on a diesel engine’s system, making it a great choice for rebuilt engines, brand new engines, or engines with high mileage. This oil contains additives that prevent metal to metal friction as well as helping clean and flush out any sludgy buildup. The only disadvantage of Royal Purple is that the gallon-sized bottles may run a little low, and there’s no markings on the container, so you have to be careful as you’re filling up with oil.


Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil

Shell’s diesel motor oil is a great choice for both new and older diesel engines as it exceeds API CJ-4 requirements. Shell’s motor oil provides fantastic performance and has enhanced viscosity control. Because of this, Shell’s diesel oil is great no matter what the external temperature is, since the viscosity doesn’t change much — making it a fantastic choice for us living in the North. The oil also has some improvised wear performance, so it provides a lot of extra protection from engine wear and tear. The oil is build to protect you from any sludge or buildup that may occur, as well as providing some enhanced performance capabilities when you need to push your engine a little harder. Only known disadvantages are that some purchasers have stated their bottles have leaked or that the oil stinks when it burns.

Always do your research when deciding on a new engine oil that is optimal for your diesel. If you have any questions, be sure to talk to one of our expert technicians, they’d be happy to help!

DFC Diesel is Edmonton’s premium diesel engine rebuilder. We have the highest standards of quality control and offer the best warranty available, all in-house. We have an unrelenting pursuit of offering the highest quality products, and have grown to be Canada’s largest diesel remanufacturing facility. If you want a great product with a great warrant, contact us today!