What are the hazards of excessively high or low engine temperature?

[McBenjamin]

The hazards of excessively high or low engine temperature are: 1. It leads to reduced cylinder air intake and abnormal combustion, resulting in decreased engine power or poor fuel economy; 2. Gasoline engines are prone to pre-ignition and knocking; 3. Engine components accelerate wear due to poor lubrication, leading to seizure or damage of parts; 4. It makes ignition difficult or combustion delayed, increasing fuel consumption; 5. The viscosity of engine oil increases, causing poor lubrication, exacerbating component wear, and increasing power consumption; 6. Unvaporized fuel at low temperatures washes the cylinder surface, destroying the lubricating oil film and accelerating component wear; 7. Difficulty in starting the engine.