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Formerly, the Hydro-treated Vegetable Oil (HVO) blended fuels has been studied by running the New European Driving Cycle (NEDC) and found that the higher HVO blended fuel can suppress NOX, lowering the particulate matter (PM) while improving the vehicle fuel economy. The result also shown that the 20% HVO + 5%FAME blended with diesel fuel has been proven to compatible with the advance diesel engine technology via the severe engine durability tests and fuel injection system tests. Therefore, the effects of two paraffinic diesel fuels, which are Gas-to-Liquid (GTL) and Hydro-treated Vegetable Oil (HVO), on a common-rail DI diesel engine have been mainly focused in this work. The main objective of this work was to study the relationships between fuel properties and theirs combustion characteristics by analyzing cylinder pressure data and exhaust emissions intensively.

Engine lubrication in the global automotive industry has many challenges in the world today. One of them is the pursuit of fuel economy which has resulted in the growing popularity of lower viscosity engine oils. However, engine wear protection of low viscosity oils is not as robust as for higher viscosity grade oils. Due to this, low viscosity grade engine oils, such as SAE 0W-20, are not common in tropical climates, though they could provide the added benefit for fuel economy. To address these two seemingly discordant performance characteristics, PTT has developed a new API SN, SAE 0W-20 engine oil with a novel viscosity modifier and conducted a field trial with extended oil drain intervals to gain a better understanding of its performance in tropical climates, especially its wear protection performance in passenger cars.