Explanation:

Recently, the Indian Oil Corporation (IOC) has sought approval from the Directorate General of Quality Assurance (DGQA) for the use of winter diesel by armed forces for operations in high altitude areas such as Ladakh.

• The winter diesel was introduced as a technological solution by the IOC in 2019 in high-altitude sectors like Ladakh, Kargil, Kaza and Keylong, which face the problem of freezing of diesel in their vehicles in extreme weather conditions.
• Winter Diesel is a specialised fuel specifically for high altitude regions and low-temperature regions such as Ladakh, where ordinary diesel can become unusable.
• Winter Diesel also meets the Bureau of Indian Standards (BIS) specification of BS-VI grade. Winter Diesel contains additives to maintain lower viscosity by enabling the fuel to remain fluid in freezing conditions. 
• It a special winter-grade diesel in India with a low pour-point of -33 Celsius, which does not lose its fluidity function even in extreme winter conditions. Hence all statements are correct.