Winter diesel

Why in news?

India’s armed forces may soon be using winter diesel for operations in high altitude areas such as Ladakh, where winter temperatures plummet to extremely low levels. State-owned Indian Oil Corporation (IOC), which is the largest oil marketing company in the country, has sought approval from the Directorate General of Quality Assurance (DGQA) of the armed forces to approve winter diesel that is said to be usable at temperatures as low as -30° celsius.

What is winter diesel?

Winter diesel is a specialised fuel that was introduced by Indian Oil Corporation (IOC) last year specifically for high altitude regions and low-temperature regions such as Ladakh, where ordinary diesel can become unusable. The flow characteristics of regular diesel change at such low temperatures and using it may be detrimental to vehicles.

Benefits of winter diesel

Winter diesel which contains additives to maintain lower viscosity can be used in temperatures as low as -30°C and that besides a low pour point, it had higher cetane rating — an indicator is the combustion speed of diesel and compression needed for ignition— and lower sulphur content, which would lead to lower deposits in engines and better performance.

Before the launch of winter diesel, consumers in areas that reached such low temperatures were using kerosene to dilute diesel to make it usable, which would lead to more air pollution.

What the armed forces are using in this area currently?

IOCL and other oil marketing companies, Bharat Petroleum Corporation Ltd and Hindustan Petroleum Corporation Ltd, provide the armed forces with Diesel High sulphur Pour Point (DHPP -W) to armed forces for operations in these areas which also has a pour point of -30°C.