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In order to meet Corporate Average Fuel Economy (CAFÉ) regulations and Bharat Stage VI (BS VI) emission regulations, Indian auto original equipment manufacturers (OEMs) are adopting low viscosity engine/axle/transmission oils to achieve overall fuel efficiency gain. Attaining fuel economy by reducing oil viscosity is already established for passenger car motor oils (PCMOs) but is in its initial phase for heavy-duty diesel engine oils (HDDEOs). Now SAE 15W-40 is the most widely used viscosity grade by volume for HDDEO. In India, a large number of old vehicles meeting BS II, BS III and BS IV norms exists and require sustainable strategy to reduce fuel consumption, as well as overall greenhouse gas emissions. In this paper, authors discussed the development of low viscosity heavy duty diesel engine oil in 10W-30 viscometrics meeting API CH4 specification.

The growing transportation sector worldwide has opened up a way forward not only for the scientists & researchers but also for the OEMs to find out the options for fuel efficient automotive vehicles with reduced emissions during their usage. The demand of automotive vehicles has been doubled in last few years and in turn the market for lubricants and transmission fluids are flourishing. Several new formulations of lubricants are getting popularized with major suppliers to achieve the end user expectations in terms of fuel economy benefits, engine life and emissions. The market trend is continuously moving towards the improvement in lubricant formulation to the lower viscosity ranges and in this direction several companies are into development of multi-grade low viscosity range of engine oils (lubricants) which is said to be providing the benefits in terms of fuel economy.