Ecological and environmental aspects in machining while using cutting fliud is to be considered , due to its impact on machinist health and environment. The use of Biodegradable oil can be an alternative source of lubricant .This paper reports the experimental results of using Mustard oil (vegetable oil) with MQL as an alternative cutting fluid while performing Turning operations on a centre lathe machine using single point cutting tool of H.S.S. .Results on tool life and tool wear were compared against other conventional coolants such as (10%Boric acid +SAE-40 Base oil) and (10% MoS2 +SAE-40 Base oil). Machine trial were performed on a solid cylindrical workpeice of mild steel at constant rotation of 250 rpm and with a single point cutting tool of high speed steel(H.S.S) . Experimental result shows that during the operation the vegetable oil performed a great cooling effect and lubrication similar to other coolants. The vegetable oil easily removed heat produced during the operation and gives proper lubrication , thus reducing friction and wear , hence improving tool life and surface finish.