* Increased emissions: Low sulfur diesel still contains sulfur, just more than ULSD. This will result in higher emissions of sulfur oxides (SOx), contributing to air pollution and potentially violating emissions regulations.
* Faster fouling of the Diesel Particulate Filter (DPF): The higher sulfur content can increase the amount of soot produced, leading to more frequent DPF regeneration cycles and potentially premature DPF failure. This is a significant cost.
* Increased wear on the fuel system: While less of a concern in modern engines with advanced fuel systems, the higher sulfur content can contribute to increased wear on fuel injectors and other components.
* Potential for injector malfunction: Although less likely in newer, common-rail systems, some older systems may be more sensitive to the higher sulfur levels, potentially leading to injector clogging or malfunction.
* Reduced fuel economy: In some cases, using lower-quality fuel can result in slightly reduced fuel economy.
In short, while it won't instantly destroy the engine, using low sulfur diesel in a vehicle designed for ULSD is suboptimal and will likely lead to higher maintenance costs, reduced performance, and increased emissions in the long run. It's always best to use the fuel specified by the manufacturer.
