What is the advised temperature for heating #4 oil before usage?

The advised temperature for heating #4 oil before usage is generally set at 135 degrees Fahrenheit. This temperature is optimal for ensuring the viscosity of the oil is reduced sufficiently, allowing for better flow and more efficient combustion in burners or engines. Heating the oil to this level improves the atomization process, which is crucial for effective burning and reduces the chances of operational issues such as fuel line clogging or incomplete combustion.

In comparison, heating the oil to a lower temperature, such as 120 degrees, may not adequately prepare the oil for effective use, risking the potential for increased viscosity issues and inefficient fuel flow. Conversely, excessive heating, such as to 200 or 220 degrees, could lead to safety concerns, including the risk of fire or equipment damage, and is generally unnecessary for optimal performance. Therefore, the choice of 135 degrees is aligned with industry practices for safety and efficiency.