In case of lubricants the viscosity is very important because it affects the oil’s ability to reduce friction and transfer heat. Failing Oil Pressure Sensor?

As a rule of thumb always follow the car manufacturer’s recommendations. You might have noticed that there are far more bottles of oil with a “W” on the label than there are with just a single SAE number. Viscosity can be objectively tested by timing how long it takes for a specific amount of oil to flow through a specific-diameter opening at a set temperature.

All Rights Reserved. 3.5 (applies to 0W-40, 5W-40 and 10W-40 grades), 3.5 (applies to 15W-40, 20W-40, 25W-40 and 40 grades). This does not mean that you can use ISO 32 in your rear end or 90W gear oil in your crankcase, only that the viscosities are similar. (Remember the discussion about the monograde and multigrade oils before?

It’s crucial that oil flows just as well when you first crank the ignition as it does when the vehicle is warmed up, otherwise there’s a risk of damaging internal components. Once again the lower the number, the thinner the oil: a 30 oil is thinner than a 40 oil at 100°C etc. Download our printable cheat sheet with BMW, Fiat, Ford, etc.

These limits are listed in the SAE J 300 table: SAE J 300 - Table of engine oil viscosity grades. Imagine filling a beaker with turbine oil and another with a thick gear oil. An oil’s kinematic viscosity is defined as its resistance to flow and shear due to gravity. Lower viscosity “0W” oils can also help provide better fuel economy, because it is easier for an engine to pump a thinner oil. This is a fixed limit and all oils that end in 40 must achieve these limits. There is no single best motor oil viscosity. Older cars are usually ok with a 10W-30 oil, while newer cars usually like a lower viscosity oil, like 5W-30, 0W-30 or sometimes even 0W-20. The number preceding the W indicates the lubricant’s viscosity grade when operating at extremely cold temperatures. For example, a 5W- motor oil will flow better at lower temperatures than a 15W- motor oil. Oil viscosity differs from one lubricant to another with respect to temperature. The lower this number is, the less viscous your oil will be at low temperatures. The quicker an oil flows, the lower its viscosity and the grade assigned to it by the Society of Automotive Engineers (SAE). And remember  that viscosity measurement rules are the same whether you choose a normal conventional motor oil, or a high tech natural gas derived full synthetic motor oil like, BMR Teams Honored In NASCAR Night Of Champions Awards Ceremony. Viscosity of these oils is measured at 212 degrees Fahrenheit; higher numbers indicate more viscous oil. Some oils change their viscosity more when temperature changes some change less. The five and 10 digits refer to the viscosity at cooler temperatures. Download our printable cheat sheet with API, ACEA, ILSAC and JASO specifications, for only 0.95 USD. There is no single best motor oil viscosity.

In case of engine oils, these grades, also known as “weights” were set by the SAE (Society of Automotive Engineers) and in order for a fluid to fall in a given category it has to meet certain limits. Your email address will not be published. High viscosity oils flow more slowly and come with a higher SAE number. Required fields are marked *. There are two numbers that define the viscosity of an oil. Older cars are usually ok with a 10W-30 oil, while newer cars usually like a lower viscosity oil, like 5W-30, 0W-30 or sometimes even 0W-20.

A 10W-30 rating means an oil has a viscosity grade of 10 in cold temperatures ("W" stands for "winter"), and 30 in warm temperatures. That W stands for “winter” and is a shorthand that tells you that you’re dealing with a multigrade oil that’s been tested to pump at extremely cold temperatures. Here Are the Warning Signs, Dead Car Battery? For lubrication purposes there is an optimal viscosity for every engine and the less the oil deviates from this optimum, the better. What Do Oil Viscosity Numbers Mean? I currently contribute as an editor to several online and print automotive publications, and I also write and consult for the pharmaceutical and medical device industry.

Simply put, viscosity is the oil's resistance to flow or, for the layman, an oil's speed of flow as measured through a device known as a viscometer. The turbine oil will flow faster because the relative … Synthetic oils have higher viscosity indices making them superior to the mineral oils in this regard as well. A lubricating oils viscosity is typically measured and defined in two ways, either based on its kinematic viscosity or its absolute (dynamic) viscosity. Check out all the chemical products available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs.

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