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The possible deficit of conventional fossil fuels in the future is an important concern throughout the world. For this reason, many international organizations and governments are working on reducing their dependence on conventional energy resources. Replacement sources of energy such as biodiesel, biomass, and bioethanol have gained prominence to substitute crude oil products. Bio-based lubricants have also gained significance as alternatives to traditional mineral-based lubricants in various applications, especially motor oils. Bio-lubricants are alternative engine oils due to their high viscosity index, good lubricating properties, high flash point, non–toxicity, high load carrying capacities, low emission, and biodegradability, but they also have their limitations. Based on previously obtained results from the multi-criteria decision analysis (MCDA) and compromise programming (CP), three types of vegetable oils were selected as the best bases for further research: castor, rapeseed, and linseed oils. Green oils were compared with commercial mineral oil - Marinol RG 1240. This article provides a detailed treatment of those propositions, as well as presented the physicochemical properties and chemical structures of plant oils. Performance evaluation of selected bio-oils as trunk piston engine oil (TPEO) was carried out by typical parameters of lubricants (viscosity-temperature characteristics, thermal, tribological and corrosion properties). It is believed that this paper will provide useful information to researchers and operators in the field regarding motor oils and service to lubricating system of marine engines.