AdBlue is a diesel exhaust fluid that helps reduce harmful emissions from diesel engines. Used in selective catalytic reduction (SCR) systems, AdBlue breaks down NOx emissions from the exhaust into harmless nitrogen and water vapor. This fluid has become widespread since 2010 when stricter emissions regulations were introduced.

But even though AdBlue has been around for over a decade now, there are still some persistent myths and misunderstandings about it. This article debunks the most common AdBlue myths that diesel drivers should be aware of.

Myth #1: AdBlue is Optional

Fact: AdBlue is required, not optional, for most modern diesel vehicles with SCR systems. Since 2010, many manufacturers have made AdBlue emissions control standard. Without AdBlue, the SCR system would stop functioning properly, causing higher emissions and often preventing the vehicle from running altogether.

Trying to bypass or remove the AdBlue system in modern diesel vehicles is illegal. Vehicles require AdBlue to comply with emissions laws. Circumventing this can risk fines, revoked registration, and failed safety/emissions inspections.

Myth #2: AdBlue is Toxic Waste

Fact: AdBlue is non-toxic and biodegradable. It poses no harm to people, plants, or pets when handled properly. Made of purified urea and deionized water, it's safe for the environment. While inhaling ammonia vapors directly should be avoided, overall AdBlue is a non-hazardous fluid.

Myth #3: Any Urea Solution Works as AdBlue

Fact: While AdBlue contains urea, not just any urea-water mixture can be used as diesel exhaust fluid. AdBlue must meet strict ISO 22241 specifications for urea concentration and purity. Off-spec blends risk corroding system components or clogging injectors.

AdBlue also contains special stabilizers to prevent urea decomposition. Using agricultural grade urea instead harms your SCR system. Make sure to use high-quality AdBlue from reputable brands that meet AUS 32 and ISO 22241 standards.

Myth #4: AdBlue is Only Necessary in Cold Weather

Fact: Many assume AdBlue is only required to prevent freezing in cold temperatures. But its use goes beyond antifreeze capabilities. AdBlue is necessary year-round for proper NOx conversion and emissions control.

The urea solution reacts catalytically to break down NOx at all exhaust temperatures, not just below 32°F (0°C). And the SCR system relies on AdBlue for proper function regardless of weather. So, while winter-grade AdBlue has extra antifreeze, standard AdBlue is still needed in warm seasons.

Myth #5: AdBlue is Harmful to the Engine

Fact: When used as intended, AdBlue causes no damage to your engine or fuel system components. The fluid injects into a separate dedicated tank and feeds only into the SCR catalytic converter. It never mixes with diesel or comes into contact with engine parts.

Not only is AdBlue harmless, but it's required for proper emissions control. Running out of AdBlue or tampering with the system is what can actually cause engine problems and limp mode. Remember to refill AdBlue regularly based on your owner’s manual. A little preventative maintenance goes a long way.

Myth #6: Any Shop Can Service the AdBlue System

Fact: While any shop can top up your AdBlue tank, it's best to have your SCR system serviced by trained diesel technicians. The sensors and components require specialized expertise, equipment, and calibration. Improper service puts your emissions at risk.

For contaminated tanks, injector cleaning, faulty part replacement, and warning light resets, visit an authorized diesel repair shop. Take advantage of dealership training to ensure your AdBlue system gets professional care when needed. Don't trust just any shop without the proper diesel credentials for SCR service.

Myth #7: AdBlue is Expensive

Fact: Considering the costs associated with modern diesel operation, AdBlue is relatively affordable. A gallon of AdBlue costs between $3-$5 on average, a fraction of the price of diesel fuel itself. And AdBlue consumption is around 2-4% of diesel usage.

With proper fill-ups timed to diesel refueling, most drivers only need to add a couple of gallons every few months. Even for those burning through more — long-haul truckers, for example — AdBlue totals remain reasonable. Just a few cents per mile is a small price to pay for lower emissions.

Myth #8: The More AdBlue Used, the Better

Fact: It’s crucial to fill your AdBlue tank appropriately for optimum SCR function. But using more than needed offers zero extra benefit. Excess AdBlue simply exits through the tailpipe as ammonia vapor, wasted rather than utilized.

Follow your owner’s manual guidelines for tank level targets and refill intervals only when the warning light activates. Pouring in extra early on or overfilling offers no emissions advantage. Stick to the recommending dosing amounts.

Myth #9: AdBlue Freezes and Corrodes Tanks

Fact: Specially formulated AdBlue contains inhibitors to prevent corrosion and freezing issues within storage tanks and lines. As long as you use reputable AdBlue that meets ISO 22241, it will not cause rust or scale even after prolonged use.

Myth #10: An Empty AdBlue Tank Damages the Engine

Fact: Letting your AdBlue tank run empty will trigger warning lights and limp mode to restrict driving speed and power. But no direct engine damage results as long as you refill it promptly. Leaving AdBlue critically low for an extended timeframe can risk hurting the SCR catalyst over time from high exhaust temperatures. But the system is designed to give you plenty of warning to prevent failure or deterioration.

Myth #11: AdBlue Filters Need Regular Replacement

Fact: Unlike oil or air, AdBlue does not require any scheduled filter changes. The fluid remains sterile as stored, with no byproducts or deposits left behind within the tank. Unless particulate contamination occurs from improper filling, the filters are maintenance-free.

Debunking Myths for Confident Use

These days AdBlue does more than just prevent freezing — it’s integral to the emissions control system. All diesel drivers should properly understand and maintain it. By debunking these myths, SCR technology seems far less intimidating so you can utilize AdBlue with confidence.

Your vehicle relies on having a precise concentration of this fluid to effectively decrease NOx output. Now that you know the facts on proper fill levels, tank regulations, contaminant risks and service needs, you can keep your AdBlue system running smoothly for the long haul.