The oil will remain viscous at -30C, but 5w40 oil will be more effective at higher temperatures, up to 50C, as opposed to 30C, while 5w30 oil will remain viscous at -30C. Watch does type of engine oil matter Video
FAQ does oil type matter
Why do different engine oils have different grades?
Engine oils have got different grades. SAE has graded them based on their viscosities. Viscosity is the quantity expressing the internal friction of the fluid. Different engine oils have different viscosities at room temperature. They also react differently to temperature changes.
Is there a right and wrong type of oil for your car?
Whichever option you choose, the next thing you need to do is decide which type of oil to use. While this may seem like a minor decision and really only comes down to how much money you want to spend, there actually is a right and wrong type of oil for your car.
How many types of engine oil are there?
In general, there are three types of engine oil: Mineral, Semi-Synthetic and Synthetic Engine Oils.
What is engine oil and why do we need it?
By providing a thin layer of oil, parts of the engine do not rub each other harshly. Thus engine oil reduces the wear and tear. During the process of combustion, fuel and as well as the oxidization of other lubricants produce acids.
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