Esso Diesel Efficient™ Fuel

Pre-additized Esso Diesel Efficient increases fuel economy by 2% versus unadditized diesel. That means less from your wallet, and more from your engine — from more power to increased responsiveness.

It’s treated with a patented additive package designed to clean up both internal injector deposits and nozzle deposits. Esso Diesel Efficient not only helps prevent those deposits from forming; it also cleans up any existing deposits to help boost engine power and reduce emissions.

Get more out of every fill at select Esso Commercial Cardlock™, Esso™ and Mobil™ stations.

Esso Diesel Efficient has been specially formulated to:

Improve your fuel economy by 2%*
Boost engine power and responsiveness
Improve injector cleanliness and provide corrosion protection

Find Esso travel centres and cardlock where Esso Diesel Efficient fuel is available.

Get a closer look

For Challenger Motor Freight of Cambridge, Ontario, cleaner-burning fuel and cleaner engines means less downtime – and a better bottom line

When drivers and owner-operators at Challenger Motor used Diesel Efficient fuel, their trucks had better fuel mileage and performance.

See how a northern B.C. fleet increased its fuel economy and reduced engine maintenance using Diesel Efficient fuel.

See how we developed Diesel Efficient fuel — and what its advanced formulation can mean for your business.

Frequently asked questions about Diesel Efficient fuel

What is Diesel Efficient fuel?

Diesel Efficient fuel is a diesel fuel that is specially engineered to help improve fuel economy and boost engine performance by cleaning up injector deposits. This new fuel also helps improve power, increase engine responsiveness and reduce emissions. Diesel Efficient fuel can also help eliminate internal injector sticking which can contribute to premature injector failure. Further, Diesel Efficient fuel offers excellent fuel system corrosion protection. Finally, Diesel Efficient fuel can help prevent premature fuel filter plugging.
Diesel Efficient fuel has been real world tested. An on-highway fleet average fuel economy benefit of 2%* has been demonstrated in testing with Diesel Efficient fuel at independent test labs following scientifically designed protocols.
*Applies to Diesel Efficient branded fuel compared to diesel fuel without detergent additive. Actual benefits will vary depending on factors such as vehicle/engine type, engine condition, driving style and diesel fuel previously used.

What types of engines would benefit from using Diesel Efficient fuel?

Diesel Efficient fuel is designed to provide benefits with light, medium and heavy duty diesel engines from different manufacturers, including on-highway heavy duty trucks.

Why would I need to use an advanced diesel fuel such as Diesel Efficient fuel today?

Modern diesel engines have very sophisticated fuel systems engineered to meet today’s stringent diesel engine emissions requirements. Deposits on the injector needle guide, which has only 2-3 microns tolerance, can jam the needle movement and cause early failure of the injectors. Deposits which build up inside the injector nozzle can restrict fuel flow, deteriorate the fuel spray quality and result in loss of engine power, increased emissions and reduced fuel economy. Diesel Efficient fuel helps prevent deposit formation and cleans up the existing deposits that may be negatively affecting your engine performance.

How is Diesel Efficient fuel different from other fuels?

Diesel Efficient fuel is treated with a patented additive package that is specially designed to clean up both internal injector deposits and nozzle deposits. Research demonstrates that Diesel Efficient fuel can help improve the performance of your diesel engine.

What kind of independent testing was done to support your claims?

Fleet demonstrations have been carried out at independent testing facilities. The test protocols used were scientifically designed to tightly control important factors such as vehicle load, driving styles, ambient conditions, and test equipment. This robust approach to testing helps ensure that the observed differences are from Diesel Efficient fuel and not from other factors. The result of this controlled testing was a 2% on-highway fleet average fuel economy improvement.*

*Applies to Diesel Efficient branded fuel compared to diesel fuel without detergent additive. Actual benefits will vary depending on factors such as vehicle/engine type, engine condition, driving style and diesel fuel previously used.

How does Diesel Efficient fuel compare to “off-the-shelf additive in a bottle”?

Intensive research and product development has been done to ensure that Diesel Efficient fuel is not only effective, but will also cause no harm to your engine. Another advantage of Diesel Efficient fuel is that the additive treat rate is optimized to yield the desired engine performance. Since the formulation is homogenized at the terminal, no additional mixing is required upon receipt.

When I convert to Diesel Efficient fuel, will my filter costs go up?

The first two to three tankfuls may result in a more frequent fuel filter replacement interval. This is due to Diesel Efficient fuel “cleaning up” the fuel system. After the initial “clean-up” process, there may be an increase in filter life as Diesel Efficient fuel can improve the filterability of the fuel filter. Diesel Efficient fuel can protect filters from plugging by saturated monoglycerides, which are introduced with biodiesel and are the lead cause of premature filter blocking. Diesel Efficient fuel can also improve fuel thermal stability which helps prevent filter plugging from decomposed fuel.

Will I still benefit from Diesel Efficient fuel even if I have a new, clean fuel system?

Yes, one of the best ways to prevent deposits from forming in a new, clean fuel system is to use Diesel Efficient fuel. The "keep clean" technology manages deposit precursors and helps prevent them from attaching to either internal or external injectors surfaces.

Will Diesel Efficient fuel accelerate the ash loading of the diesel particulate filter?

Diesel Efficient fuel contains ashless detergent technology and therefore should not contribute to the ash loading of the diesel particulate filter. Diesel Efficient fuel can clean up injector deposits to promote better spray quality and better fuel/air mixing. In theory it should reduce engine particulate matter emissions and soot loading in the DPF, (no direct testing has been carried out to demonstrate this).

*Applies to Diesel Efficient fuel compared to diesel fuel without detergent additive. Vehicle testing showed an average fuel economy improvement of 2%. Actual benefits will vary depending on factors such as vehicle/engine type, driving style and diesel fuel previously used. Concentration and availability of our proprietary additive package may vary based upon factors beyond our control.

© Copyright 2003-2025 Imperial Oil Limited. Esso, Esso Commercial Cardlock and Key to the Highway are trademarks of Imperial Oil Limited. Imperial Oil, licensee. Diesel Efficient is a trademark or registered trademark of Exxon Mobil Corporation or one of its subsidiaries. Imperial Oil, licensee. Other trademarks shown are property of their respective owners.