1. In addition to lubricating (reducing friction between moving parts), engine oil performs what functions? 1. Cools. 2. Seals. 3. Cleans. 4. Prevents corrosion. 5. Cushions impact (shock) loads. A. 1, 2, 3, 4. B. 1, 2, 3, 4, 5. C. 1, 3, 4.