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Advances in renewable energy sources and impact of green house gases on climate change have led intense research in the area of renewable energy for transport and power generation sectors. All over the world gaseous fuels have gained momentum as an ideal alternative fuel for meeting future energy needs. Hydrogen enriched compressed natural gas (HCNG) may be considered as an alternative automotive fuel which does not require any major modification in the existing CNG engine and infrastructure. Several studies of HCNG fuel were reported on small and light duty engines / vehicles, but limited reports are available on heavy duty engines. In this study, experimental investigations were carried out on a 6 cylinder heavy duty CNG engine which has been optimized for 18 percent HCNG. Initial performance of the engine on HCNG was compared vis-à-vis CNG and, thereafter, the engine was subjected to endurance test as per BIS 10000 norms for 100 hours (severe cycle) with HCNG.

In an earlier paper[1] we had emphasized the need for diesel engine lubricants meeting specific built-in specifications to combat the stress emanating out of the geographical, operational and engine design requirements in Indian subcontinent for heavy duty sectors. In this paper we present our work in identical domains for a segment utilizing passenger car and/or utility vehicles. This paper presents our work on development of a diesel engine oil to meet the specific requirements of a thermally-stressed IDI engine with respect to key performance attributes. The laboratory optimization for thermo-oxidative stability typical of requirements for IDI engines coupled with higher level of dispersancy and wear inhibition that are identified with current generation lube oils have further been established in engine test programs. The superior performance has been established in endurance test on a representative engine.