ENGINE
369
FACTS ABOUT ENGINE OIL
CONSUMPTION
Functions of engine oil
Engine oil has the primary function of lubricating and cooling
the inside of the engine, and plays a major role in maintaining
the engine in proper working order.
Engine oil consumption
It is normal that an engine should consume some engine
oil during normal engine operation. The causes of oil
consumption in a normal engine are as follows.
Oil is used to lubricate pistons, piston rings and cylinders.
A thin film of oil is left on the cylinder wall when a piston
moves downwards in the cylinder. High negative pressure
generated when the vehicle is decelerating sucks some of
this oil into the combustion chamber. This oil as well as
some part of the oil film left on the cylinder wall is burned
by the high temperature combustion gases during the
combustion process.
Oil is also used to lubricate the stems of the intake valves.
Some of this oil is sucked into the combustion chamber
together with the intake air and is burned along with the
fuel. High temperature exhaust gases also burn the oil
used to lubricate the exhaust valve stems.
The amount of engine oil consumed depends on the
viscosity of the oil, the quality of the oil and the way the
vehicle is driven.
More oil is consumed under driving conditions such as high
speeds and frequent acceleration and deceleration.
A new engine consumes more oil, since its pistons, piston
rings and cylinder walls have not become conditioned.
When judging the amount of oil consumption, keep in
mind that the oil may have become diluted, making it
difficult to judge the true level accurately.
For example, if a vehicle is used for repeated short trips and
consumes a normal amount of oil, the dipstick may not show
any drop in the oil level at all, even after 1000 km (600 miles)
or more. This is because the oil is gradually becoming diluted
with fuel or moisture, making it appear that the oil level has
not changed.
The diluting ingredients evaporate out when the vehicle is
then driven at high speeds, as on an expressway, making it
appear that oil is excessively consumed after driving at high
speeds.
Summary of Contents for GS300 1998
Page 1: ...1 PG005 2 PICTORIAL INDEX 1 INSTRUMENT PANEL ...
Page 3: ...3 PG016 PICTORIAL INDEX 3 INSTRUMENT CLUSTER GS400 sold in U S A ...
Page 5: ...5 PG006 PICTORIAL INDEX 5 INSTRUMENT CLUSTER GS300 sold in U S A ...
Page 7: ...7 PG017 PICTORIAL INDEX 7 INSTRUMENT CLUSTER GS400 sold in Canada ...
Page 9: ...9 PG007 PICTORIAL INDEX 9 INSTRUMENT CLUSTER GS300 sold in Canada ...
Page 13: ...13 PICTORIAL INDEX 13 ...
Page 21: ...BASIC OPERATION QUICK REF ERENCE 8 ...
Page 47: ...KEYS AND DOORS 34 ...
Page 50: ...SWITCHES 37 12G001 ...
Page 66: ...SWITCHES 53 EMERGENCY FLASHER SWITCH 12G005 ...
Page 70: ...SWITCHES 57 ...
Page 73: ...GAUGES METERS AND SERVICE REMINDER INDICATORS 60 ENGINE COOLANT TEMPERATURE GAUGE 13G009 ...
Page 87: ...74 ...
Page 91: ...INTERIOR EQUIPMENT 78 PERSONAL LIGHTS Front 14G004 1 ...
Page 120: ...EXTERIOR EQUIPMENT 107 ...
Page 157: ...COMFORT ADJUSTMENT 144 16G056 1 ...
Page 166: ...COMFORT ADJUSTMENT 153 16G033 ...
Page 175: ...COMFORT ADJUSTMENT 162 B Convertible seat 16G035 C Booster seat 16G037 ...
Page 190: ...COMFORT ADJUSTMENT 177 16G052 Move seat fully back ...
Page 207: ...AIR CONDITIONING AND AUDIO 194 20G002 1 Air flow selection ...
Page 209: ...AIR CONDITIONING AND AUDIO 196 20G003 1 ...
Page 263: ...AIR CONDITIONING AND AUDIO 250 ...
Page 270: ...STARTING AND DRIVING 257 IGNITION SWITCH WITH STEERING LOCK 31G001 ...
Page 276: ...STARTING AND DRIVING 263 31G029 ...
Page 346: ...IN CASE OF AN EMERGENCY 333 40G014 Tie down points ...
Page 354: ...IN CASE OF AN EMERGENCY 341 ...
Page 392: ...CHASSIS 379 400 Suspension and chassis 401 ...
Page 415: ...CHASSIS 402 ...
Page 418: ...ELECTRICAL COMPONENTS 405 64G015 Driver s side kick panel 64G014 Passenger s side kick panel ...
Page 419: ...64G013 ELECTRICAL COMPONENTS 406 Engine compartment ...
Page 420: ...ELECTRICAL COMPONENTS 407 64G026 Engine compartment Canada only ...
Page 448: ...ELECTRICAL COMPONENTS 435 64G012 ...