The physical properties of motor oil are viscosity, pour point, flash point, NOACK volatility, acidity and alkalinity. These properties vary based on the grade of motor oil and the petroleum base stock from which it is derived. They also reflect the presence of preservatives and other additives in oils that contain them.Know More
AMSOIL states that a motor oil's grade label reveals its viscosity rating. The higher the rating, the more viscous the oil. These grades also indicate the oil's pour point, a measure of how the oil behaves in cold temperatures. Oils labeled with the prefix "W" before the viscosity number pour well in very cold environments, while other motor oils do not pour well in such conditions. Viscosity increases with temperature, but even cold engines require immediate lubrication.
According to California Scientific, the flash point of motor oil is the minimum temperature at which it ignites. This measurement is extremely important because motor oil is flammable. The higher the flash point, the more desirable the oil. Distillation removes many of the flammable compounds present in crude oil, and petroleum distillation removes more of them. Consequently, the flash point of quality motor oil is much higher than the flash point of both crude oil and petroleum.
Another important physical property of motor oil is its NOACK volatility score. This reflects its evaporation rate in extremely hot environments. Most applications require a NOACK volatility score below 15 percent.Learn more about Engine Oil
The best motor oil for most car engines depends on the relative age of the car. Synthetic motor oils, such as Amsoil Synthetic Blend 15W-40 Heavy Duty Motor Oil and Mobil 1 10W-30 Full Synthetic Motor Oil, are best for most cars, while older cars may require higher viscosity oils.Full Answer >
The average density for motor oil is 0.865 grams per cubic centimeter, which is about 7.2 pounds per gallon. The density of the oil depends on the formula of motor oil used and the temperature of the oil.Full Answer >
According to the Argonne National Laboratory, petroleum products do not freeze (crystallize), but their viscosity can become very high and adversely affect the instruments they run in, such as a motor. Viscosity is determined by what kind of motor oil or petroleum product is in question and by temperature.Full Answer >
The main difference between a synthetic oil and a synthetic blend is that the blend is made by mixing synthetic and conventional oil together, according to J.D. Power. This blend offers many of the benefits of a synthetic oil, but at a more affordable price.Full Answer >