Oil is essential for lubricating and cooling mechanical systems, particularly in gas turbines. Oxidation, sludge accumulation, and reduced viscosity due to excessive oil heating can lead to increased wear and potential component failure. This study examines the viscosity characteristics of oil within a temperature range of 40 ℃ to 100 ℃, with load ranges of 2–5 kN and velocities from 90 to 190 m/s. MATLAB simulations and empirical tests facilitated the development of mathematical models based on hydrodynamic lubrication principles. At a pressure of 2000 N and a speed of 90 m/s, the maximum film thickness observed at 40 ℃ was 1224 µm, while the minimum thickness recorded at 100 ℃ was 200.8 µm. At a velocity of 170 m/s, the greatest thickness attained was 2312 µm, whereas the minimum was 379.3 µm. Reducing the speed to 150 m/s under the same load resulted in a maximum thickness of 2040 µm and a minimum of 334.7 µm. The results indicate that elevated temperatures reduce viscosity and decrease the lubrication film, particularly under substantial loads, while increased speeds enhance lubricant retention and film thickness. Our findings align with many previous works, which demonstrated that elevated temperatures reduce oil viscosity and influence friction performance, in contrast to some earlier investigations that show temperature changes significantly alter the chemical properties of oil, thereby reducing its lubricating efficiency.