The pumping difference is pretty straightforward, but what about shearing oil? You will not be enrolled in advertising or marketing programs and your information will not be shared or sold. Then we start losing engine life and durability. That’s the hydrodynamic lubrication created when the crank slides across the wedge of oil provided by your oil pump inside the bearings. If you’re more concerned about your engine durability, and you run engines to the very end of their useful life, and a couple percentage points of fuel economy is not that attractive, then you may choose 15W-40. This is why we have seen a constant decrease in the cruising speed of heavy duty engines, so that the parasitic losses are lowered, and fuel economy improves. The tradeoff is choosing between lower viscosity to decrease pumping and shearing losses, versus keeping the crankshaft from touching the bushings by floating on a wedge of oil (the technical term is hydrodynamic lubrication.) Mostly we are working at atmospheric pressure or a bit above so we can consider that relatively constant. Please try again or contact us for assistance. A kinematic viscosity grade typically consists of either a single number (mono viscosity grade) or two numbers with a dash between them (multi viscosity grade). And the slower it is sheared, or the thinner the oil is, the less energy we lose. Below are the kinematic viscosity numbers for AMSOIL OE Series Synthetic 0W-16, 0W-20, 5W-20 and 5W-30 measured at 40°C. If you go through the motion very slowly, the amount of work isn’t much different than doing it in air (kinematic). By submitting your email address you agree to receive email information, great offers, and more from Team Valvoline. Thanks for signing up. The common dynamic viscosity used for fuel economy improvements is referred to as the High Temperature High Shear (HTHS) viscosity. Viscosity is affected by three things, temperature, pressure, and the speed that you shear it (which relates to engine speed). Engine Oil SAE 10W-40 - kinematic viscosity and density over temperature SAE 10W-60. However, when you compare a 10W-30 vs a 15W-40, at both low and high temperatures the 10W-30 will be thinner, with less resistance to flow. Viscosity [mPa.s] Kin. If your engine has been modified, then understanding this can help you make the right choice. When you see a W on a viscosity rating it means that this oil viscosity has been tested at a Colder temperature. A kinematic viscosity grade typically consists of either a single number (mono viscosity grade) or two numbers with a dash between them (multi viscosity grade). It is used to report the absolute viscosity of an motor oil at colder temperatures. Since most heavy-duty oil is multi viscosity, we will concentrate on the two-number system. For example, a 5W-40 oil will be thinner in cold temperatures than a 15W-40, but at normal operating temperatures both oils will flow the same. The loading of the piston through the connecting rod leads to the upper bushing on the connecting rod and on the lower bushing in the main bearings being the first to show wear. It is often one of the first parameters measured by most oil analysis labs because of its importance to oil condition and lubrication. Kinematic viscosities of common liquids like motor oil, diesel fuel, peanut oil and many … Liquids - Kinematic Viscosities - Kinematic viscosities of common liquids like motor oil, diesel fuel, peanut oil and many more; Melting points of oils - Common oils from animals or plants and their melting points; Motor Oils - Dynamic Viscosity - Dynamic viscosities for motor oils SAE 10 to 50 - temperature range 0 - 100 deg C Since most heavy-duty oil is multi viscosity, we will concentrate on the two-number system. Pick the right viscosity and your engine will thank you for it, by continuing to do its job. Set your password and start earning reward points for everything you do on the site. Kinematic Viscosity is a measure of the fluids resistance to flow and shear under the forces of gravity, or how easily the oil flows to the different parts of the engine. Lower viscosity oil reduces parasitic losses, improving fuel economy and power. The difference is when the viscosity is tested at a much … The combustion force results in the connecting rod trying to push the crankshaft out of the bottom of the block. So that’s kinematic viscosity. Kinematic Viscosity (ASTM D445/ISO3105): 1 centi-Stoke (cSt) = 1 mm2/s. Do Carbon Cabin Filters Provide Safer Breathing Air In Your Car? How is it that CK oils are different viscosity than FA oils, even if they are both 10W-30? We have the technology in oil today to modify the viscosity such that the viscosity acts differently as speed changes, to help us meet the requirements of today’s modern engines. Just remember, corn syrup is high, corn liquor is low. If your engine is stock, stick to what the engineers were using when they designed and developed your engine. These increase cylinder pressures often well above the manufacturers design limits, so we would not recommend a lower viscosity oil. Also think how much harder it would be in corn syrup than it would be in water. When parts are machined, even very smooth surfaces are not so smooth when you look close enough. Advanced manufacturing techniques make this possible, and we work closely with engine manufacturers to create just the right balance of economy and durability. Think about throwing a baseball under water. But as you try to throw it faster, the force necessary goes up at a higher rate than the change in speed of your arm (dynamic). There are three dynamic viscosity measurements that define the SAE grade. Let’s start with the hardware. Oildepot.ca - All rights reserved. 0W-16 vs. 0W-20, 5W-20 And 5W-30 Motor Oils, 2021 Arctic Cat Snowmobile Oil Suggestions, Free AMSOIL Upper Cylinder Lubricant With $75 Order, 2021 Polaris Snowmobile Oil Recommendations, 2021 Ski-Doo Snowmobile Oil Recommendations, AMSOIL $5 Shipping Promo For PC And Catalog Orders. It makes sense that the rougher the surfaces, the more oil thickness required to keep them from contacting each other. The second number to the right (40 in this example) represents the kinematic viscosity at a normal engine operating temperature, usually 100 degrees C. The lower the kinematic viscosity number, the thinner the oil.