▎ 摘　　要

NOVELTY - A graphene vegetable oil based full composite environmentally-friendly engine oil comprises 75-80 pts. wt. castor oil, 2-3 pts. wt. graphene, 0.5-0.7 pts. wt. dispersant, 0.1-1 pt. wt. affinity agent, and 19-25 pts. wt. modified castor oil. USE - Graphene vegetable oil based full composite environmentally-friendly engine oil. ADVANTAGE - The environmentally-friendly engine oil has low friction coefficient. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the engine oil, which involves adding all components except the affinity agent to castor oil, ultrasonically oscillating at 50 kHz to 1 MHz and 30 W to 15 kW for 1 hour to obtain a mixture, adding the affinity agent, and carrying out microwave treatment at 65-75 degrees C and 200-6000 W/L for 1-4 hours.