Volatility

Compared to gasoline, diesel is less volatile. The volatility of fuel indicates how easily it evaporates and how it influences a diesel engine’s operability and stability.

One way to measure diesel volatility is by looking at distillation specifications. The distillation limits are usually set at 10%, 90%, and the final boiling point to obtain a more complete combustion of the fuel. Incomplete combustion means more emissions and lower fuel economy.

A high boiling point means that diesel has heavy components, which will increase soot and engine deposits.

Saudi Arabia’s diesel specification SASO 844:2021 sets the maximum temperature for 95% v/v distillation recovered (T95) at 360°C. This specification was implemented in the second half of 2022.

Before 2022, diesel sold in Saudi Arabia