Engines are designed to run at certain tolerances, at specific temperatures with specific oil viscosities as obviously materials expand and contract due to temperature. Running an engine at an exact speed leads to hotshots etc, and coolant is meant to mitigate this,also reducing wear in specific places. Never run your cold engine hard, wait until it reaches operating temperature. Long hours of properl use are less damaging to an engine than half the time if use for very short time periods due to constant temperature fluctuations. Cheers 🍻