![]() See below a chart demonstrating some example oil grades and outside temperature ranges. Straight SAE 30 oil is often used for smaller cooled engines in lawnmowers, garden tractors and portable generators. Monograde oils such as SAE 30, 40 and 50 are no longer used in the latest automotive engines but may still be required for us in vintage or classic engines. The viscosity of oil stands for its level of resistance to flow and shear. Įxample – a good way to remember how oil reacts to temperature is by imagining you’re adding cooking oil in to a frying pan – at first, when the oil hasn’t had a chance to heat up it starts out quite thick but once the pan gets hotter, the oil becomes thinner and more runny. This demonstrates the oils resistance to thinning at high temperatures. The second number after the W represents the oils viscosity measured at 100 degrees Celsius. So, a 5W-30 would thicken less than a 10W-30 but more than 0W-30. The number before the W represents the viscosity (thickness)and rates the oil’s flow at -17.8 degrees Celsius. ![]() The first number followed by the letter W describes the viscosity of oil at low temperatures (the W stands for winter). The term viscosity refers to the thickness of the oil and its resistance to flow. RELATED: 0w20 vs 5w20 vs 5w30 Oil Viscosity Explained. You shouldn’t see that drastic of an issue when using them interchangeably. ![]() With that said, neither of these is going to make a big difference under normal conditions. When using CJ-4 oil with higher than 15 ppm sulfur fuel, consult the engine manufacturer for service interval. However, both of these oils feature the same viscosity rating in warmer temperatures and conditions. That’s why the viscosity grade on the oil bottle is made up of two numbers. API CJ-4 oils exceed the performance criteria of API CI-4 with CI-4 PLUS, CI-4, CH-4, CG-4 and CF-4 and can effectively lubricate engines calling for those API Service Categories. The W stands for WINTER, this is commonly mistaken by many who consider this to stand for Weight. The SAE (Society of Automotive Engineers) scale shows the viscosity of oil at both hot and cold temperatures.
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