Detergent additives, to clean and neutralize oil impurities
which would normally cause deposits (or sludge)
on vital engine parts.
Friction modifiers used in increasing fuel
economy by reducing friction between moving
parts. Its balanced mix takes care of wet
clutch also.
Viscosity modifiers make an oil's viscosity lower for cold
starts.
Deposit control additives prevent the formation of soft sludge and hard deposits of impurities.
Corrosion or oxidation or rust inhibiting
additives retard the oxidation of metal inside
an engine.
Antioxidant additives retard the decomposition of the stock
oil.
Antiwear additives or wear inhibiting additives cause a film
to surround metal parts, helping to keep them
separated.
Pour point depressants improve the oil's
ability to flow at lower temperatures .
Anti-foam agents inhibit the production
of air bubbles and foam in the oil which can
cause a loss of lubrication , pitting , and
corrosion where entrained air contacts metal
surfaces.
Seal conditioners cause gaskets and seals to swell so that
the oil cannot leak by.
Metal deactivators create a film on metal surfaces to prevent the metal from causing the oil to be oxidized.
Extreme pressure agents bond to metal surfaces,
keeping them from touching even at high pressure
.
Dispersants cause contaminants (e.g. soot
) to be suspended in the oil to prevent them
from coagulating .
Wax crystal modifiers are dewaxing aids
that improve the ability of oil filters to
separate wax from oil.
