What is it with DEF?
Just what is the Diesel Exhaust Fluid (DEF) ? What does it do and why do I need it? This is my first diesel and I never heard of it.
Forum Discussion
In essence, SCR technology allows manufacturers to reduce NOx emissions after they are created by means of converting them into safer compounds. While it is seemingly inconvenient and costly to keep the DEF tank filled, SCR technology has many benefits.
• Increased fuel economy when compared to non-SCR equipped trucks with diesel particulate filters. SCR equipped trucks are able to operate under leaner conditions and take advantage of a diesel's ability to operate within a broad spectrum of air-to-fuel ratios. Under light load conditions, and SCR equipped truck can run much leaner while adhering to emissions regulations. This ability had been previously shrouded, as NOx emissions are greatest when an engine is operated on the leaner side of the acceptable air-to-fuel ratio spectrum.
• Reduced strain on the EGR system, since the EGR system is no longer the sole combatant against NOx emissions. This promotes a more reliable, problem free EGR system.
• Reduced strain on DPF, since the engine's are able to run leaner and an engine produces less particulate matter at such operating conditions.
• Cleaner emissions. Nitrous oxides can cause or increase the effects of a number of respiratory problems, as well as contribute to the formation of acid rain.
• Increased fuel economy when compared to non-SCR equipped trucks with diesel particulate filters. SCR equipped trucks are able to operate under leaner conditions and take advantage of a diesel's ability to operate within a broad spectrum of air-to-fuel ratios. Under light load conditions, and SCR equipped truck can run much leaner while adhering to emissions regulations. This ability had been previously shrouded, as NOx emissions are greatest when an engine is operated on the leaner side of the acceptable air-to-fuel ratio spectrum.
• Reduced strain on the EGR system, since the EGR system is no longer the sole combatant against NOx emissions. This promotes a more reliable, problem free EGR system.
• Reduced strain on DPF, since the engine's are able to run leaner and an engine produces less particulate matter at such operating conditions.
• Cleaner emissions. Nitrous oxides can cause or increase the effects of a number of respiratory problems, as well as contribute to the formation of acid rain.
