8/18/2023 0 Comments Sae oil viscosity chart for f![]() ![]() Forty years ago, there were winter grades for cold weather and summer grades for warmer weather. ![]() A 10W-30 is a multi-grade (two viscosities) motor oil, and as the name implies, it meets more than one grade. It stands for “Winter” and that is the key to understanding viscosity grades. Understanding viscosity promotes the ability to reduce wear, improve fuel economy, and make more horsepower.įor starters, in oil nomenclature, “W” does not stand for “Weight”. Unless you’re racing in really high heat situations – like desert truck racing – there’s really no need to go more than that.Viscosity is the most important property of a lubricant. For my street cars, I use 0W-30 I often drive my street cars at temps well below 0*F. There are some excellent spintron studies that show a 40 weight oil is better at stabilizing the valve train at high RPM’s. If you make good oil pressure with a 30 weight oil, changing to a 50 or 60 weight oil is detrimental to your engine. Thicker oil requires more energy to move around, moves a little slower, and puts more strain on those moving parts because of the higher energy requirements. Generally speaking, you need enough viscosity to maintain proper oil pressure in all situations. □ What Do I Need?Īgain, it depends on what you’re doing. I don’t want the oil viscosity to be over 1,400! I don’t want to be pumping grape jelly in there.Ībove charts are shamelessly stolen from here: Shhh, don’t tell them. Have you ever started your race engine when it’s freezing out there? I have. In the two charts above, compare the viscosity at at each temperature point. Even if the oil temp is 65*F when you turn the crank, that lower viscosity will lubricate the engine that much faster. Many engineers argue that you should use the lowest cold viscosity you can find. Again, there’s that standard for measurement.Īlso, remember that the viscosity is not 5 or 40, it’s a range between them, mostly dependent on temperature. It means that it will pour like a 5 weight oil that has been cooled to 32*F. That’s especially bad on a high pressure valve train.ĥW doesn’t mean the oil will have a viscosity of 5. The thicker the oil is, the harder it is to get moving, and the longer it takes. That’s when a large amount of engine wear occurs – when the engine is cold, the parts are moving, and all the oil is in the oil pan, not doing any good. ![]() It’s a measurement of how well the oil flows when the engine is first started. The winter weight rating – 5W, 10W – is important. What? Winter weight? it’s a race car, who cares about winter? Unless you’re ice racing, of course. A 20 weight oil ranges from 35 to 75 on the kinematic scale. If you look at the SAE viscosity charts, you’ll see that a certain viscosity of engine oil can actually cover a large range of actual kinemetic viscosities. To standardize things, it’s generally agreed that lubricant viscosity will be measured at 40*C(100*F) and 100*C (212*F). Once again, Google is your friend.Īs you know, fluids pour differently and various temps. You can’t compare motor oil to gear oil, it’s a different scale. And the charts are different for different kinds of lubricants. There are various ways to measure viscosity. The maple syrup has a greater viscosity than water. It’s a simple measurement of “thickness”, “pour-ability”, or “weight”. In a nut shell, it’s how easily the oil pours. Whew, that last bit was kind along winded, don’t you think? Anyway, we’ll move on to viscosity. ![]()
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