Best Howes Diesel Additives in 2026

Prevents Fuel From Gelling - Howes Diesel Treat is the nation’s most trusted anti-gel. Its special formula has been tested and proven time and again to prevent gelling in even the coldest weather. Owners of all types of diesel vehicles and equipment rely on the Howes family’s guaranteed product to keep them going all winter long.

Adds Lubricity - Diesel Treat helps protect against today’s Ultra Low Sulfur Diesel (ULSD) fuels by providing added lubricity to injectors, pumps, and upper cylinders. In doing so, it extends the life and increases the performance of diesel engines of all types.

Prevents Deposits - More than just an anti-gel, Diesel Treat also contains a specialized detergent package to help prevent fuel injector deposits. Carbon deposits on diesel injector systems can cause loss of engine power and other issues. Preventing these helps to improve performance and fuel economy, saving you money.

Anti-Gelling Formula - Reduces the formation of wax crystals in diesel fuel during cold weather, to keep fuel flowing smoothly and prevent it from clogging the system or fuel filter

Improves Cold Starts - Significantly enhances cold-weather performance and disperses moisture to prevent fuel line freeze-ups, even in temperatures as low as -40 degrees Fahrenheit

Keeps Fuel System Healthy - Acts as a fuel injector cleaner and lubricity additive to reduce engine wear and keep your vehicle healthy, efficient, and performing at peak capacity

Improves Power – Original Stiction Eliminator restores lost engine power and compression by removing sludge and varnish deposits from engine components, and neutralizing harmful acids that cause corrosion

Protects Engine Components – Original Stiction Eliminator reduces engine wear and cures and prevents symptoms of stiction and low-quality engine oil including failing HEUI injectors, black smoke, hard starts, and weak turbo boost

Cleans Fuel System – Diesel Extreme deeply cleans any diesel fuel system, safely removes and prevents diesel injector deposits, and boosts cetane

Take Care Of Your Engine With An Every-Tank Solution For Better Performance And Health

Boosts Cetane Up To 7 Points For Better Fuel Economy And Maintenance

Adds Lubricity To Protect Fuel System Including Pump And Injectors

Prevents Gelling - Minimizes the size of wax crystals that form in diesel fuel during cold weather, so it can still travel through the fuel system, even at temperatures 20°F below the wax solidification point.

Improves Cold Starts - Makes it easier for your engine to start even in subzero temperatures, by acting as a cetane booster and fuel system protector.

Increases Diesel Lubricity - Works as a fuel stabilizer and fuel injector cleaner to ensure that your fuel system is protected, lubricated, and operating at its best.

Restores/Increase Horsepower: detergents clean deposits in the injection system

Reduces Fuel Consumption tests show an average of 4 percent improvement in MPG and gains up to 9.6 Percent

Cetane Improver improves combustion resulting in better engine starting, running and reduced noise

Adds Up To 2.5x More Lubricity - With more lubricity than any other Howes product and many on the market, Diesel Defender is the ultimate choice for heavy duty vehicles. It provides protection by significantly reducing wear scars, with independent lab* results confirming Defender treated fuel outperformed the US (520mm) and more stringent European (460mm) standards. *via the wear scar test for ASTM D975 High Frequency Reciprocating Rig (HFRR)

Cleans Fuel Injectors - Uses superior IDX4 Detergent to attack and destroy even the toughest carbon deposits. When used as directed, Diesel Defender is designed to clean the entire fuel system within three treatments and prevent future deposits from forming. The removal of these deposits keeps the diesel fuel system performing optimally and increases power.

Increased Fuel Economy Guaranteed - By safely removing water, Diesel Defender leaves only pure fuel to burn. Your clean injectors then allow for a steady spray pattern, so none of that fuel is wasted. When used regularly, Diesel Defender guarantees a minimum 5% increase in fuel economy.

Diesel hi-test, cetane boost

Flash point: 63.0 degrees_celsius

Regular use keeps the fuel system in perfect working order.

A powerful and safe way to eliminate damaging sludge and gum from aged or contaminated fuel tanks

Unclog fuel lines while rejuvenating old, stale gasoline and diesel fuel

Does not contain any chemical strippers, alcohol or detergents and is safe for use in all engines