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A 10W-30 oil must pass the SAE J300 viscosity grade requirements for both 10W and 30, and all limitations placed on the viscosity grades, such as the requirement that a 10W oil must fail the 5W requirements. Viscosity index improvers (VIIs) are special polymer additives added to oil, usually to improve cold weather performance in passenger ...
Breakdown of VIIs under shear is a concern in motorcycle applications, where the transmission may share lubricating oil with the motor. For this reason, motorcycle-specific oil is sometimes recommended. [19] The necessity of higher-priced motorcycle-specific oil has also been challenged by at least one consumer organization. [20]
AMSOIL 10W-40 Synthetic Motor Oil became the first synthetic motor oil in the world to meet American Petroleum Institute (API) service requirements in 1972. [2] [1] The company created its tagline, "The First in Synthetics®," to acknowledge the achievement. Newspaper ad showing that AMSOIL synthetic motor was commercially available by 1968.
It stipulates the lubricating oil requirements for 2-stroke gasoline engines, such as those used in motorcycles, general-purpose machines, and outboard motors, [1] and was established in 1994. [2] For 2-stroke oil, lubricity, cleanliness, exhaust smoke, and exhaust system blockage are evaluated using the test methods specified in JASO M 340, M ...
where U is the oil's kinematic viscosity at 40 °C (104 °F), Y is the oil's kinematic viscosity at 100 °C (212 °F), and L and H are the viscosities at 40 °C for two hypothetical oils of VI 0 and 100 respectively, having the same viscosity at 100 °C as the oil whose VI we are trying to determine.
Consequently, if a liquid has dynamic viscosity of n centiPoise, and its density is not too different from that of water, then its kinematic viscosity is around n centiStokes. For gas, the dynamic viscosity is usually in the range of 10 to 20 microPascal-seconds, or 0.01 to 0.02 centiPoise. The density is usually on the order of 0.5 to 5 kg/m^3.
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