What is the condition of oil at 175 degrees Celsius?
2 Answers
Medium heat is approximately 140°C~180°C, at which point the oil surface ripples and moves around, with a slight blue smoke rising. When ingredients are added, a large number of bubbles appear around them, accompanied by a sizzling sound. Low-medium heat, around 100°C, is characterized by white bubbles forming on the oil surface, with no sound or blue smoke. High heat, around 200°C, sees the oil surface becoming calm again, with blue smoke rising vigorously. Additional information: Cold oil temperature: Approximately 10-20% heat, the oil surface is calm. Inserting chopsticks into the oil shows no change. Low oil temperature: 30-40% heat, the oil surface is calm with a few bubbles, slight sound, and no blue smoke. Inserting chopsticks into the oil shows almost no bubbles around them. Medium oil temperature: 50-60% heat, the oil surface bubbles mostly disappear, stirring produces sound, and a small amount of blue smoke moves from the sides to the center of the pan. Inserting chopsticks into the oil causes small bubbles to form around them.
I've been driving for almost 30 years. I remember that time when I was driving my old pickup truck on the highway, and suddenly the dashboard showed an oil temperature of 175 degrees, with steam rising from under the hood. I quickly pulled over, popped the hood, and found the fan belt had snapped and the radiator was completely clogged. That temperature was way too high—normal engine oil temperature should be around 90 to 110 degrees. At 175 degrees, the oil becomes as thin as water and can't lubricate the parts properly. If left unchecked, the engine internals would wear out and be ruined. Since then, I always check the cooling system and belt condition during maintenance to avoid similar dangers. This kind of overheating usually happens during long uphill drives or when the fan fails. Never push through it—shut off the engine immediately to cool it down and get it fixed at a repair shop.
