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Car Care

Diesel Engines And Premium Synthetic Oils

Posted: 12/18/2013

Today’s diesel vehicles can benefit from the improvements in performance and protection offered by a premium synthetic motor oil
Today’s diesel vehicles can benefit from the improvements in performance and protection offered by a premium synthetic motor oil.

(NAPSI)—It’s a new day for diesel engines. That’s the word from experts who say improvements in diesel technology and fuel composition have made diesel vehicles more appealing to a broader group of consumers.

Because of these improvements, people who choose diesel vehicles report better gas mileage and increased torque. Plus, diesel vehicles typically hold their value in the resale market better than those with gasoline-powered engines.

While in the past many thought that you could not use a synthetic oil in a diesel engine, that is not the case. Today’s diesel vehicles can benefit from the same improvements in performance and protection that a premium synthetic motor oil, such as Royal Purple, offers gas-powered vehicles.

Common Questions

To help, here are some answers to common questions about using a synthetic oil in a diesel vehicle.

• Is it possible to run synthetic for one oil change and then switch back to mineral oil? Yes. Most synthetic oils including Royal Purple are compatible with other mineral and synthetic oils. You will want to check the label on the manufacturer’s bottle for confirmation.

• What is the difference between 5W-40 and 15W-40 for diesel engines? Assuming they are American Petroleum Institute (API) licensed (CI-4, CJ-4, etc.), both are effective SAE 40 weight oils. As the oil cools from engine operating temperature, the 5W-40 will thicken less than the 15W-40. The smaller the first number of the viscosity, the better the fluid flows when cold.

Depending on the age of your engine, older diesel engines may see a slight increase in oil consumption with lighter oil.

• Do you need to adjust the viscosity of your oil based on where you live? Sometimes. The way you use your vehicle is also a factor. In general, many auto manufacturers recommend an “all temperature” viscosity. Your owner’s manual will indicate which “all temperature” oil is recommended for your vehicle and location.

• What about premium oil filters? It’s a good idea to use a premium oil filter in tandem with a synthetic oil. Oil filters prevent contaminants from circulating through the system, causing damage. Premium oil filters offer superior filtration media and internal and structural components made of high-quality material.

If you’re considering purchasing a diesel vehicle, don’t forget that maintaining the vehicle is key.

For more information, visit


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