Vegetable oils due to high biodegrability, low toxi city, renewability and excellent lubricating perfor mance, have immense potential to replace petroleum oils as feed stock for lubricants. In these study vegetable oils like soybean oil, castor oil, groundnut oil, and cottonseed oil was purchased from local super market. The physicoc hemical properties like viscosity, acid value, saponificati on value, iodine value of four different vegetable oils and there blends in 10:90 to 90:10 proportion were studied. F rom this study, it was found that viscosity of pure vegetable oils and there blends regularly decreased with increased in temperature and viscosity of soybean oil blends with castor oil found to be higher than other blenders. Also ac id value of same blends found to be lower than othe r blends. Higher viscosity and lower acid value of castor oil blends in soybean oil suggest that these blends di rectly use an alternative lubricant for mineral oil based lubrica nts.