© Scania

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Industrial & Marine Engines

Lubricconsu

Industrial an

Measuremen

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program 96

ating oilmption

d Marine engines

t and assessment

CV AB, Sweden, 1998:01

Program 96

Lubricating oil consumption -measurement and assessment

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General

“Lubricating oil consumption” is understood to be the amount of lubricating oil that is consumethrough combustion in the engine.

Fuel consumption must be taken into considertion when assessing lubricating oil consumptioBoth are affected by the type of driving and operating conditions.

Lubricating oil consumption is generally higherwhen the engine is new. Not until the engine hbeen run-in (600 hours of operation) can it be considered that lubricating oil consumption is constant.

Normally, lubricating oil consumption in Scaniaengines will then be less than 0.6% of the fuel consumption.

Lengthy periods of running at high engine speeds and low power demand will, however, cause lubricating oil consumption to increase slightly in relation to fuel consumption.

Under such conditions, lubricating oil consumption may still be considered acceptable even ifexceeds 0.6% of fuel consumption.

Checking lubricating oil consumption

To avoid over-hasty and unnecessary measurebeing taken against the possibly excessive consumption of lubricating oil, consumption shouldbe carefully checked for at least 300-500 hoursof operation after the above-mentioned runningin period.

If follow-up measures show that lubricating oil consumption is definitely higher than normal, thengine should be examined and rectified as neessary.

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Instructions and documentation for follow-up measures

Fuel and lubricating oil consumption should becalculated on the basis of data with as high a degree of accuracy as possible.

Start with a full fuel tank and lubricating oil up to the maximum mark on the dipstick.

If fuel consumption cannot be obtained, as mighbe the case if several engines are connected tosame fuel tank, an average power output figurekW should be specified.

Check the dipstick when all lubricating oil in theengine has run down into the sump. The vehicshould be parked on a level surface.

If the engine is still at operating temperature, thdipstick can be checked up to three minutes afthe engine has been stopped. Wait at least fiveminutes after stopping before checking the dipstick if the engine was started but had not attained operating temperature.

Copy the form “Driver’s logbook for measuringoil consumption“ and use it for keeping a recorof replenishing fuel and lubricating oil as well arunning hours and type of driving during the folow-up period.

CV AB, Sweden, 1998:01 01:00-02

Program 96

Example of completed driver’s logbook

Engine serial number 5 555 555 Brand of oil Shell

Oil change interval 400 hours Designation Myrina

Person responsible Name Viscosity 15W/40

Date Meter

reading, hours

Fuel replenished,

litres

Full tank

Consumptionlubricating oil,

litres Main type of driving

960401 600 Yes 960403 625 1200 7 Highway driving

960601 1100 800 Yes 5total 20 000 100

Fuel consumed = 20,000 litres

Oil consumed = 100 litres

Oil consumption as % of fuel consumption =

10020000

x 100 = 0,5%

01:00-02 © Scania CV AB, Sweden, 1998:01 3

Program 96

Driver’s logbook for measuring oil consumption

Engine serial number . . . . . . . . . . . . . . . . . . . . . . Brand of oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Oil change interval . . . . . . . . . . . . . . . . . . . . . . . . . Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Person responsible . . . . . . . . . . . . . . . . . . . . . . . . Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Date Meter

reading, hours

Fuel replenished,

litres

Full tank

Consumptionlubricating oil,

litres Main type of driving

4 © Scania CV AB, Sweden, 1998:01 01:00-02