9/9/2023 0 Comments Sae oil viscosity chart for fBut be aware that as it’s a thinner oil, it might not lubricate engine parts as well as 10W-40 as temperatures continue to increase. That said, you can still use 10W-30 motor oil in warm weather. This higher viscosity oil is designed for hotter temperatures and can handle the added heat stress from the environment. So, if you drive in a warm climate - especially more than 32☌ (90☏) - or have an engine that runs hotter than others, 10W-40 oil viscosity is a good option. SAE 10W-40 motor oil: -25☌ (-13☏) to 40☌ (104☏)ġ0W-40 motor oil’s greater tolerance for hotter temperatures means that it’s better at resisting thermal breakdown and reducing deposit formation.Here’s the recommended ambient temperature range for each oil grade, in general: However, 10W-40 engine oil is more viscous in hotter climates and has a better temperature spectrum. High Operating Temperature Or Warm Weatherġ0W30 oil and 10W40 perform the same at cold temperature startups. Its higher viscosity at running temperature can reduce engine effectiveness as it’ll need more energy to keep the engine operating. A low viscosity oil will move quicker through the engine to keep it lubricated and cool.Īdditionally, if your engine has a lower running temperature, 10W-40 motor oil might be too thick. In cold weather, engine oil only deals with engine heat as the cold temperature of the environment won’t add thermal stress. That said, the somewhat thinner 10W30 oil will perform better in colder climates. So cold starts shouldn’t be an issue with these two oils. Low Running Temperature Or Cold WeatherĪs we already know, 10W-30 and 10W-40 have the same oil viscosity at lower temperatures.Īn oil type with a 10W winter rating won’t have problems in sub-zero ambient temperature, down to -30☌ (-22☏). Let’s see how each oil viscosity influences when and where you use them: 1. The primary difference between 10W-30 and 10W-40 lies in their viscosity at higher temperatures. Next, let’s find out how these multi viscosity oils compare in application and performance. In that case, 10W-40 motor oil would technically provide better protection against engine wear contact in higher temperatures. This means that at 100 oC, 10W30 engine oil has the viscosity of an SAE 30 single grade oil, and 10W40 oil has SAE 40 viscosity.ġ0W40 oil has a higher viscosity, retaining more thickness than 10W30 as the temperature rises. The higher the number, the more viscous or thicker, the oil is at higher temperatures. This is often regarded as the engine’s operating temperature. The second number (after the ‘W’) represents the oil’s viscosity at 100 oC (212 oF). The lower the number is, the thinner and more viscous the oil. This number is particularly important for vehicle startup when the engine is still cold, and the oil needs to flow quickly to lubricate it. So these oils act like an SAE 10W single grade oil at lower temperatures. Low temperatures are typically considered anything under 0 oC (32 oF).īoth 10W-30 and 10W-40 oils have a “10W” rating - an SAE grade for winter use (thus the ‘W’ appended onto it). The first number represents the oil’s viscosity at a low temperature. The first grade is the number before the “W,” and the second one is after.īut what do these numbers represent, exactly? Sometimes they’re called a “multi weight oil.” 10W-40 and 10W-30 are multigrade oils, meaning they carry the properties of two different grades of oil.
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