Can No. 0 Diesel and No. -35 Diesel Be Mixed for Use?
2 Answers
No. 0 diesel and No. -35 diesel can be used together. Diesel fuels of the same brand can be blended: Diesel fuels of the same brand can be blended to reduce the freezing point of high-freezing-point diesel. However, it should be noted that the adjustment of the freezing point does not follow a strict additive relationship. For example, when No. -10 and No. -20 diesel fuels are blended in a 50-50 ratio, the resulting freezing point is not -15°C, but rather between -13°C and -14°C. To lower the freezing point, ensure thorough mixing after blending. Gasoline must not be mixed into diesel: Gasoline must not be mixed into diesel for use because gasoline has a higher auto-ignition temperature and poorer ignition performance compared to diesel. Mixed use can lead to difficulties in starting the diesel engine, black smoke from the exhaust pipe, or even failure to start. The diesel engine may also experience knocking, which increases wear on components. Additionally, excessive deposits or carbon buildup may form in the combustion chamber and exhaust system, severely impairing lubrication and causing premature damage to the diesel engine.
I often encounter friends asking this question: can you mix No. 0 diesel and No. -35 diesel, especially when gas station options are limited. Last winter, I tried adding some -35 diesel to my tank because No. 0 diesel's antifreeze performance was too weak, and mixing seemed to improve cold resistance. However, I later noticed that the engine would shake during startup, and the power output was noticeably weaker. After consulting a mechanic, I learned that mixing different diesel grades could lead to filter clogging, incomplete combustion, and potential conflicts between additives in different diesel types. It might work for short trips, but long-term use could damage the fuel system and increase maintenance costs. If you really have to mix them temporarily, try to keep the proportion small—preferably below half—but even that carries risks. In cold regions, I highly recommend switching directly to higher-grade diesel. Saving money isn’t worth compromising safety, and using the right fuel ensures a smoother and more reliable drive.
