16 items found. For further information on glossary terms contact us
Polyalphaolefin, synthetic oil. Compared to mineral oils these oils are more resistant to heat and oxidation. Better for low temperature starting and offering higher oil film strength which improves protection for components.
Hydrocarbons belonging to the series starting with methane (CH4). Paraffins are saturated with respect to hydrogen. High molecular weight paraffins are solid such as paraffin wax.
A minute piece of matter with observable length, width and thickness, usually measured in micrometers.
An emissions control device that allows gases from the crankcase to be reintroduced into the intake.
A test in which a cone is dropped into a grease sample to measure the penetration or how hard or soft the grease is at room temperatures. The cone penetrates farther in a soft grease and therefore has a higher penetration number. This penetration relates
A measure of acidity or alkalinity. Values of pH run from 0-14; 7 indicating neutrality, numbers less than 7 indicate increasing acidity, and numbers greater than 7 indicate increasing alkalinity.
Surface cavities, may be related to fatigue, overload or corrosion.
Engineering science pertaining to gaseous pressure and flow.
Unit of viscosity, defined by the shear stress required to move one layer of fluid along another over a total thickness of one centimetre at a velocity of one centimetre per second. This viscosity is independent of fluid density, and directly related to f
Excessive smoothing of the surface finish of the cylinder bore or cylinder liner in an engine to a mirror-like appearance, resulting in depreciation of ring sealing and oil consumption performance.
Chemical combination of similar type molecules to form larger molecules.
Is a widely used low-temperature flow indicator and is 3°C above the temperature at which a normally liquid petroleum product maintains fluidity. It is a significant factor in cold-weather start-up, but must be considered along with pumpability, the ease
Additive used to lower the pour point or lower the temperature fluidity of a petroleum product.
Ignition of the fuel/air mixture in a gasoline engine before the spark plug fires. Often caused by incandescent fuel or lubricant deposits in the combustion chamber, it wastes power and may damage the engine.
A non-toxic liquid used as a coolant/antifreeze in cooling and heating systems.
The low temperature, low shear stress-shear rate viscosity characteristics of an oil that permit satisfactory flow to and from the engine oil pump and subsequent lubrication of moving components.