What’s DEF?

As we approach the colder months around Ft. Lauderdale and Riviera Beach, discussions about winter truck maintenance are bound to include the topic of DEF freezing point. But, what’s DEF, and how does its tendency to freeze affect your driving? Let’s explore Diesel Exhaust Fluid (DEF) and everything you need to know about DEF freeze with our experts!

What’s DEF & How is It Made? 

Diesel Exhaust Fluid (DEF) is a non-toxic solution that plays a critical role in reducing harmful nitrous oxide emissions from diesel engines. Comprising 32.5% high-purity urea and 67.5% deionized water, DEF works with the Selective Catalytic Reduction (SCR) system to transform these emissions into harmless water and gas, ensuring compliance with federal environmental standards.

DEF is meticulously formulated to ensure effectiveness in your vehicle’s SCR system. Always ensure you’re using certified DEF products that adhere to strict standards such as:

• The American Petroleum Institute (API)
• German Institute of Standardization DIN70700
• The International Organization for Standardization ISO 22241-1
• AUS – 32 Specifications

Does DEF Freeze?

Does DEF freeze? Yes, it does. With a DEF freezing point of 12 degrees Fahrenheit (-11 degrees Celsius), DEF can solidify in chilly winter conditions experienced in places like Ft. Lauderdale. The mixture’s urea concentration is critical, as properly mixed DEF will freeze and thaw uniformly, preserving its quality and effectiveness.

What is the DEF Freezing Point?

At the recommended 32.5% urea concentration, you can expect the lowest possible DEF freezing point of 12°F. This uniform freezing and thawing mean that the integrity of DEF is maintained across temperature changes, which is crucial for the continued efficiency of your vehicle’s SCR system.

Does DEF Freeze: How Can I Prevent DEF Freeze Issues?

While you cannot prevent the DEF itself from freezing, the vehicle’s SCR system is designed to mitigate any issues by heating the DEF tank and supply lines, which thaw the fluid automatically. Here are additional tips to handle DEF in cold weather:

• Avoid Additives: Do not add anti-gelling agents or freeze point improvers to DEF. These can harm your SCR components.
• Proper Storage: Store DEF in a cool, dry place away from direct sunlight to maintain its quality.
• Check Expiry Dates: DEF does degrade over time; always check expiration dates to ensure effectiveness.

Learn More About DEF and Vehicle Care at Rechtien International Trucks

If you have further questions about DEF, SCR systems, or other auto concerns in Ft. Lauderdale and Riviera Beach, don’t hesitate to contact us at Rechtien International Trucks. We’re here to assist with all your vehicle needs and to offer additional winter driving tips. Visit us or reach out today to enhance your knowledge and driving experience.