In this ppt we have brief discussion about engine oil, grades and its working function. Full full info click on attachment.

1. All about Car Engine Oil

2. What is Car engine oil?
• Motor oil, engine oil, or engine lubricating substance is any
of assorted substances comprising base oils increased with
additives, significantly antiwear additive and detergents,
dispersants and, for multi-grade oils viscousness index
improvers. additionally thereto, most lubricating oils
contain corrosion (GB: rust) and oxidisation inhibitors. oil is
employed for lubrication of burning engines. the most
operate of oil is to cut back friction and wane moving
elements and to wash the engine from sludge (one of the
functions of dispersants) and polish (detergents). It
conjointly neutralizes acids that originate from fuel and
from oxidisation of the lubricating substance (detergents),
improves protection of piston rings, and cools the engine
by carrying heat off from moving elements.

3. • Motor oil may be a stuff utilized
in combustion engines, that power cars, motorcycles,
lawnmowers, engine-generators, and lots
of alternative machines. In engines,
there are elements that move against one another, and
therefore the friction wastes otherwise helpful power
by changing the K.E. to heat. It conjointly wears away
those elements, that may lead to lower potency and
degradation of the engine. This will increase fuel
consumption, decreases power output, and
might result in breakdown.

4. Properties of engine oil.
• Most motor oils area unit made up of a heavier,
thicker fossil oil organic compound base stock
derived from fossil oil, with additives to boost
sure properties. the majority of a typical gas
consists of hydrocarbons with between eighteen
and thirty four carbon atoms per molecule. one
among the foremost necessary properties of gas
in maintaining a lubricating film between moving
components is its consistency.

5. • The consistency of a liquid are often thought of
as its "thickness" or a live of its resistance to flow.
The consistency should be high enough to take
care of a lubricating film, however low enough
that the oil will flow round the engine
components beneath all conditions. Fuel
Injection & Engine Management consistency
index could be a live of what quantity the oil's
consistency changes as temperature changes. a
better consistency index indicates the consistency
changes less with temperature than a lower
consistency index.

6. Grades of engine oil
• The Society of Automotive Engineers (SAE) has established a
numerical code system for grading motor oils in step with their
consistence characteristics. the first consistence grades were all
mono-grades e.g. a typical engine oil was a SAE thirty. this can be as
a result of as all oils skinny once heated, therefore to urge the
correct film thickness at in operation temperatures oil makers
required to start out with a thick oil to attain this. This meant in
weather it'd be troublesome to start out the engines because the
oil was too thick to crank. However, as oil additive technology was
introduced that allowed oils to travel less skinny as quick (i.e. a
better consistence index), this allowed choice of a agent oil to start
out with e.g. a product that acts like AN SAE fifteen at cold
temperatures e.g. 15W (W for winter) and also the finish half its
performance at 100C

7. Single-grade
• A single-grade engine oil, as outlined by SAE J300,
cannot use a compound consistency Index
Improver (also observed as consistency Modifier
or VII) additive. SAE J300 has established eleven
consistency grades, of that six area unit thought
of Winter-grades and given a W designation. The
eleven consistency grades area unit 0W, 5W, 10W,
15W, 20W, 25W, 20, 30, 40, 50, and 60. These
numbers area unit usually observed because the
"weight" of a oil, and single-grade motor oils area
unit usually referred to as "straight-weight" oils.

8. Multi-grade
• The temperature vary the oil is exposed to in most vehicles will be wide, starting
from cold temperatures within the winter before the vehicle is started up, to hot
operational temperatures once the vehicle is absolutely warm up in hot summer
weather. a particular oil can have high consistency once cold and a lower
consistency at the engine's operational temperature. The distinction in viscosities
for many single-grade oil is simply too giant between the extremes of
temperature. To bring the distinction in viscosities nearer along, special compound
additives known as consistency index improvers, or VIIs square measure more to
the oil. These additives square measure accustomed build the oil a multi-grade oil,
tho' it's potential to own a multi-grade oil while not the utilization of VIIs. the
concept is to cause the multi-grade oil to own the consistency of the bottom grade
once cold and therefore the consistency of the second grade once hot. this permits
one sort of oil to be used all year. In fact, once multi-grades were at first
developed, they were often delineated as all-season oil. The consistency of a
multi-grade oil still varies logarithmically with temperature, however the slope
representing the modification is lessened. [clarification needed] This slope
representing the modification with temperature depends on the character and
quantity of the additives to the bottom oil.

9. • We hope you like our presentation on Car
Engine Oil. We always should take car of
engine by changing engine oil time to time or
in every service.