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Study on Fuel Efficiency and Durability Aspect of a Low Viscosity Heavy Duty Diesel Engine Oil
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 15, 2020 by SAE International in United States
Due to CAFÉ regulations and advanced emission regulations for Indian auto industry, fuel efficiency gain via lower viscosity lubricants is a trend in auto industry. Achieving 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. Again the emission norms and CAFÉ regulations are applicable for new engines whereas a large population of vehicles in India is old vehicles meeting BS II, BS III and BS IV norms. It is also important to reduce fuel consumption in those vehicles to help in the reduction of GHG emissions. In this paper, the authors discuss the development of a low viscosity heavy duty diesel engine oil in 10W30 viscometrics meeting API CH4 specification. Fuel economy credential of the developed product was carried out on a chassis dyno wrt the reference oil following “Delhi Bus Driving Cycle”. The authors also discuss the effect of viscosity on the engine durability in mileage accumulation test of 40,000 kms run in chassis dyno by monitoring engine wear in used oil analysis. Finally to establish the fuel economy benefit and oil performance in field, a field trial was conducted on old BS II and BS III buses in two bus depots. Fuel economy (FE) was calculated based on the KPTL (kms per ten lts) value of the candidate oil w.r.t. the reference oil. From the trial data it was established that driving condition also affect the FE and more stop and go condition reduces fuel economy benefits.
- Snigdhamayee Praharaj - Indian Oil Corporation Ltd.
- Sandeep Kumar - Indian Oil Corporation Ltd.
- Sarita Seth - Indian Oil Corporation Ltd.
- M Subramanian - Indian Oil Corporation Ltd.
- Sarita Garg - Indian Oil Corporation Ltd.
- Deepak Saxena - Indian Oil Corporation Ltd.
- SSV Ramakumar - Indian Oil Corporation Ltd.