Search Kanady for:
|
 |
[ Products ] [ Industries ] [ Brochures ] [ FAQ ] [ Contact Us ] [ Find Us ] [ Technical Help ]
Here you will find answers to our most frequently asked questions:
(If you have any other question that you would like answered please
click here for Technical Help. We will endeavour
to respond to you by the end of the day).
| 1 |
What is a "high VI oil"?
|
| |
The term "VI" stands for Viscosity Index, which is the
degree of variation in viscosity with temperature changes. Oils
with a high degree of change are "Low VI Oils". Those with a low
degree of change are "High VI Oils".
It is important that an
engine oil's viscosity change is kept to a minimum; this is
achieved by selecting a high VI base oil and adding a Viscosity
Index Improver Additive.
|
| 2 |
What is the difference between a monograde and a
multigrade engine oil?
|
| |
Both types of oil are assigned SAE numbers. The greater the
number, the higher the viscosity of the oil.
Low viscosity oils are ideally suited to cold temperature
operations offering ease of cold starting and rapid flow to
working components thereby reducing wear.
High viscosity oils offer protection at elevated
temperatures and are better suited to summer use.
Monograde oils can therefore only operate over a limited
temperature range.
Multigrade oils are now very much the preferred choice for
automotive, petrol and diesel manufacturers.
Viscosity Index (VI) improvers are amongst the most
important of engine oil additives. They are molecules that
swell to thicken the oil as it becomes hotter, thereby
creating the multigrade characteristics.
|
|
|
