What Type of Engine Oil Should Be Used at -40 Degrees Celsius?
2 Answers
At -40 degrees Celsius, 0W engine oil should be used. The functions of engine oil include: 1. Reducing friction and wear between moving parts; 2. Absorbing heat generated in the engine combustion chamber and piston top, cooling the engine and protecting it from overheating; 3. Preventing pollutants and oxide impurities produced during combustion from adhering to the engine interior, keeping it clean; 4. Neutralizing acidic substances generated by combustion gases to prevent engine rust and corrosion. The method for changing engine oil is: 1. Lift the vehicle with a jack; 2. Drain the old engine oil; 3. Remove the oil filter; 4. Install a new oil filter and refill with new engine oil.
In my car repair experience, at minus 40 degrees, you need to use specially low-viscosity engine oil, usually models starting with 0W. For example, 0W-30 or 0W-40, which have good fluidity in extreme low temperatures and can quickly lubricate engine components. If you use high-viscosity oil, like 10W or 15W, the oil will thicken like honey, making cold starts difficult or even damaging the engine. I also remind everyone to check the owner’s manual and choose oil according to the vehicle’s requirements; if there’s no manual, using API-standard full synthetic oil is more reliable. Additionally, regularly check the oil level and replace it to avoid carbon buildup. Warming up the car for a few minutes before driving in severe cold also helps. Remember, choosing the right oil not only protects the engine but also saves fuel and repair costs.
