The ongoing study, related to MQL turning trials, tries to make a relative examination regarding influence of oil viscosity of two different veg. oils (different oil viscosity) on measured output parameters—cutting forces, surface roughness. The turning trials were conducted using two different vegetable oils as cutting fluids in the MQL turning of round bars of austenitic stainless steel SS-316. The first oil, i.e., Oil-A was Canola oil and the other one, i.e., Oil-B, a mix of castor oil plus soyabean oil in the proportion of 1:2 with oil’s flowing rate of 180 ml/hr. Although the better outcomes, in terms of surface finish, were noticed with higher speed = 80.00 m/min, and using Oil-A (3.11 µm) as greasing agent, yet the Oil-B (3.22 µm) might be considered as the better option as the cutting component of forces obtained were lesser at speed of 80.00 m/min, using Oil-B (143.54 N), than Oil-A (149.41 N). In the present work it has been found that in MQL turning of round bars of austenitic stainless steel SS-316, Oil-B—a mixture of castor oil in soyabean oil (ratio 1: 2; more viscous) provided better results for output parameters in comparison with Oil-A—canola oil (less viscous). Further, in Oil-B mixture, the castor oil is a non-edible veg. oil, which is widely used in industries for lubrication applications, so its mixture with soyabean oil can be easily adopted for industrial applications.