Investigating kinds of vegetable oil was done to substitute products with petroleum base because they have environmentally friendly features as well as they become vital sources for bio-fluids. The vegetable oil is useful because it is available as a renewable source. Moreover, the lubricants having bases of vegetable oil nature have designated potential for decreasing carbon dioxides as well as hydrocarbon emissions once they operate within an interior combusting engine also within industry

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... cess. Two methods for using vegetables' fluids as bio-fluids, the first is by direct using of neat vegetables' fluids with no blending and the second is by using specific rate of blending the vegetable oils along with the commercial fluids. Regarding the current work, investigating the mixing rate effects of mineral oil with double kinds of vegetable fluid was done on the thermal characteristics then a comparison was done with commerce oils using machine of four-ball type. Corn fluid (CON) and castor fluid (CAS) got blended separately at volumetric rate that ranges between 20 up to 80% with commercial mineral oils. Each experimentation work conforms to ASTM D4172. According to the outcomes, a number of blends of corn and castor fluids along with commerce oils reduced the scar diameter and increase the flash temperature parameter (thermal performance) compared to mineral fluid. Both blends exhibit lower friction's constant in comparison with oils of commercial lubricants. One could conclude that some blends of corn or castor fluid with commerce oils have well-performance in comparison with commerce oils or neat corn or neat castor fluid.