In this study, 15W40 engine oil and Safflower oil were blended at 10% (A10), 20% (A20), 50% (A50) ratios. A total of 5 lubrication oil samples were obtained by adding the samples of pure safflower oil (A100) and lubrication oil with no safflower (A0). Viscosity and density tests of A100, A50, A20, A10 and A0 samples were carried out. Wear diameter test was performed on a four-ball testing machine to examine wear and friction properties, and welding load test was performed to examine extreme pressure properties. We also had a study in the safflower oil industry where it can be used as an engine oil additive, especially in internal combustion engines. Since safflower oil is of vegetable origin, its use in engine oils will be environmentally friendly.As a result of the examinations, it was determined that as the safflower ratio in the samples increased, the performance increased in terms of viscosity under cold working conditions. When the wear and friction performance was evaluated, it was concluded that there was an improving performance in 15W40 engine oil in A10, A20 and A50 samples in which safflower was used as an additive. When these samples were evaluated in terms of performance, there was little variation between them. For this reason, it is concluded that when Safflower is used as an additive in general, it exhibits positive performance in wear and friction performance. Considering that bio-lubricants are environmentally friendly, it can be said that the A50 sample is the most suitable lubrication oil among the samples, since it contains more vegetable oil than other samples. As a result of this study, it is seen that the use of Safflower oil as an additive in engine oil is a positive result in terms of improving and clean environment.