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Oil System 67

Oil Consumption

Once the engine is stopped, check the oil

level daily. If the engine has just been

stopped and it is warm, wait approximately

five minutes to allow the oil to drain back

to the oil pan before checking. Add oil as

necessary.

Note: DO NOT overfill. Oil may be blown

out through the engine breather tube if the

level is too high.

All diesel engines are designed to use some

oil, so it is normal to add oil periodically. An

engine used in heavy duty operation will use

more oil than one in normal operation.

Owners often ask what is considered

“normal” oil consumption. This is dependent

on the operation of the engine. Just as one

engine in a heavy operation may get only

5 mpg fuel consumption and another gets

over 8 mpg, the oil consumption will vary in

different applications.

To determine “normal” oil consumption, it

is therefore important to establish what is

normal for your engine in your application.

Establish a record of oil usage and compare

with other vehicles in your fleet. There are

two methods that are frequently used:

•

Miles per quart of oil. Simple way to

establish a history of the consumption.

Useful as a comparison to others only

when vehicle and engine is compared to

an identical vehicle and engine under

identical operating conditions.

•

Amount of fuel used per amount of

fuel used (oil consumption relative

to fuel consumption). Better way to

relate the oil usage to the actual work

of the engine. Also only useful in

comparison when compared under

identical conditions.

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