![]() Through increasing film thickness and strength, oil viscosity decreases machine susceptibility to particle contamination and wear rate.įurthermore, the viscosity of motor oils influences: The film strength rises at very high temperatures and loads. Viscosity also influences film strength, which allows the oil to reduce friction and wear. Oil viscosity increases due to high pressures, allowing full-film separation even under harsh operating circumstances. One of the primary functions of motor oil is to provide a thick coating that separates two metal surfaces and inhibits metal-on-metal contact. The viscosity of engine oil affects the operation of your cars, machinery, and equipment in a variety of ways.įor starters, it influences film thickness. The engine will start more quickly in the winter with thin oils less likely to thicken in the cold and run more efficiently in the summer with thick oils less likely to thin in the heat. It’s crucial to consider the environment the automobile will be used in when comparing lubricants. It will perform better in the summer and hotter climates by using oil with higher viscosity at 100 degrees Celsius. The engine will gain from using oil with low viscosity throughout the winter and for vehicles in colder climates. Video can’t be loaded because JavaScript is disabled: Engine Oil Codes Explained, SAE (Society of Automotive Engineers) numbers – Oil Viscosity Explained () Here’s a very informative video on understanding the numbers in motor oil products: The digits after the “XW” stand for the oil’s resistance to thinning at high temperatures and denote viscosity at 100 degrees Celsius. The oil thickens less in cold temperatures, so the lower the number. The viscosity (flow) of the oil is rated at zero degrees Fahrenheit by the number before the “W” (winter) (-17.8 degrees Celsius). The standard classification “XW-XX” is used to indicate viscosity. The Society of Automotive Engineers created a scale for engine and transmission oils. There is no way to predict the impact of mixed oil, so ideally, you should only mix the closest oil grade or mix to top up when you are low in oil. Still, the rest of the operation depends on the difference between the two oils you have mixed. Mixing engine oil with different viscosity is a better option than running low in oil or empty, which can have a detrimental effect on the engine. This refers to a situation where you are stranded and have no other way to add an identical oil type and viscosity to your car. There is clear evidence of the potential to mix different oil viscosities so that it does not have any detrimental effects on the engine. Since the lubricating oil complies with the American Petroleum Institute (API) there is the potential to mix engine oils if the standard is met. Read more:Ĭan You Mix 5W20 and 10W30 Motor Oil? Yes, But Read This First Can I Mix 5w30 And 10w40 Oil? Yes But Not Recommended Can You Mix 5w30 And 5w40 Oil? Yes But Not Ideal ![]() When you mix engine oil with different viscosities, it can result in an unpredictable impact on your engine’s performance. The numbers or oil grades indicate how the oil flows under specific temperatures. Yes, mixing engine oil with different viscosities is generally safe but should only be done as a last resort. Why do different vehicles require different viscosities? What does viscosity have to do with engine protection?
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