Is an engine water temperature of 65 to 70 degrees normal?

[MacErin]

An engine water temperature of 65 to 70 degrees is normal. Engine temperature too low: This can make the combustible air-fuel mixture difficult to ignite or slow to burn, resulting in reduced engine power. The engine oil becomes thicker due to low temperature, increasing viscosity and resistance to moving parts. Incompletely vaporized fuel can wash away the oil film on friction surfaces like cylinder pistons and piston rings, dilute the oil, accelerate component wear, or cause incomplete combustion of the mixture, increasing fuel consumption. Engine operating temperature too high: Excessive thermal expansion of air reduces the engine's volumetric efficiency, disrupts the air-fuel ratio, enriches the mixture, leads to incomplete fuel combustion, and also results in increased fuel consumption.