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| Hydrofinishing |
A
process for treating raw extracted
base stocks with hydrogen to saturate
them for improved stability. |
| Hydrolytic
Stability |
Ability
of additives and certain synthetic
lubricants to resist chemical
decomposition (hydrolysis) in
the presence of water. |
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|
| Induction
Period |
In
an oxidation test, the time period
during which oxidation proceeds
at a constant and relatively low
rate. It ends at the point where
oxidation rate increases sharply. |
| Inhibitor |
Additive
that improves the performance
of a petroleum product by controlling
undesirable chemical reactions
i.e., oxidation, inhibitor, rust
inhibitor, etc. |
| Insolubles |
Contaminants
found in used oil due to dust,
dirt, wear particles or oxidation
products. Often measured as pentane
or benzene insolubles to reflect
insoluble character. |
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|
| Kinematic
Viscocity |
Measure
of a fluid's resistance to flow
under gravity at a specific temperature
usually 40 degree C or 100 degree
C. |
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|
| Lands |
The circumferential areas between
the grooves of a piston.
|
| Lead |
Commonly
used name for tetraethyl or tetrramethyl
lead, an additive used in gasoline
to improve octane ratings. Elemental
lead is commonly used in sleeve
bearing and bushing alloys. |
| Lubrication |
Control
of friction and wear by the introduction
of a friction reducing film between
moving surfaces in contact. May
be a fluid, solid or plastic substance. |
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|
| Multigrade
Oil |
Engine
or gear oil that meets the requirements
of more than one SAE viscocity
grade classification, and that
can be used over a wider temperature
range than a single grade oil.
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