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Demulsibility Properties

Ability of an oil to separate water

Density Parameters

Mass per unit of volume.

Detergent Chemicals

Additive to keep engine parts clean. In motor oil formulations, the most commonly used detergents are metallic soaps with a reserve of alkalinity to neutralize acids formed during combustion.

Detonation Engine Performance

Uncontrolled burning of the last portion (end gas) of the air/fuel mixture in the cylinder of a spark-ignition engine. Also known as knock or ping.

Differential Engine Parts

Set of gears that transfers the power from the drive shaft to the drive wheels and allows those wheels to turn at different speeds.

DIN Industry Associations

German testing standards - Deutsche Industrie Norm

Dispersant Chemicals

Additive that helps keep solid contaminants in crankcase oil in colloidal suspension, preventing sludge and varnish deposits on engine parts. Usually non-metallic (ashless), and used in conjunction with detergents.

Distillation Processes

Separation of a mixture of liquids with different boiling points by progressively raising the temperature. In a refinery distillation unit the temperature rises continuously from the top to the bottom of the column and different fractions or cuts are draw

DPF, Diesel Particulate Filter Engine Parts

Diesel Particulate Filter, sometimes called a DPF, is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine.

Drag Properties

Resistance to movement caused by oil viscosity.

Dropping Point Parameters

The temperature at which a grease changes from semisolid to a liquid state under test conditions. It may be considered an indication of the high temperature limitation for application purposes.

Dynamic Viscosity Parameters

Viscosity of a liquid as measured in a rotational instrument, as distinct from the kinematic viscosity where the liquid falls through a capillary tube under its own weight.

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