This study examined splash lubrication—where rotating crankshafts entrain oil to coat moving parts—for high‑speed engines and compressors. We detailed the operating principle, system components (sump, pump, crank geometry), and film‑formation mechanics. Performance metrics such as cooling efficiency, wear reduction, and oil consumption were evaluated. Advantages include system simplicity and reliability; drawbacks involve oil‑level sensitivity and viscosity constraints at low speeds. Applications span internal‑combustion engines, gas compressors, and turbines. Recommendations focus on oil‑level monitoring strategies and viscosity selection to optimize longevity and performance.