Molybdenum Disulphide Chemical compound of molybdenum and sulfur which has excellent properties as a solid lubricant due to the type of molecular structure of the particles. A numerical indication of a gasoline's ability to prevent detonation under high speed, high load engine operation. Multipurpose Grease Lubricating grease suitable for a variety of applications such as chassis, wheel bearings, universal joints and water pumps on automotive equipment. N top Neutralization Number Measure of the acidity or alkalinity of an oil. NLGI Service Classification System System of letter designations to define classes of automotive chassis and wheel bearing greases.
Oils containing viscosity index improvers exhibit non-Newtonian flow.
Nitration Process whereby nitrogen oxide attacks petroleum fluids at high temperatures, often resulting in viscosity increase, corrosion and deposit formation. O top Octane Number Term numerically indicating the relative antiknock value of a gasoline. The octane number of a gasoline basically depends on its hydrocarbon composition and is improved by the addition of antiknock compounds. The lowest octane number reference fuel that will allow an engine to run knock free under standard conditions of service. OR is a characteristic of each individual engine.