owners manual Toyota Celica

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 ’03MY CELICA U (L/O 0208) Facts about engine oil consumption
Keep the back door closed while FUNCTIONS OF ENGINE OIL The amount of engine oil consumed de- driving. An open or unsealed backEngine oil has the primary functions of pends on the viscosity of the oil, the quality of the oil and the conditions the door may cause exhaust gases to lubricating and cooling the inside of the vehicle is driven under. be drawn into the vehicle. engine, and plays a major role in main-
To allow proper operation of yourtaining the engine in proper working order.More oil is consumed by high–speed driv- vehicle’s ventilation system, keep ENGINE OIL CONSUMPTION ing and frequent acceleration and decel- It is normal that an engine should con-eration. the inlet grilles in front of the wind- A new engine consumes more oil, since shield clear of snow, leaves, or oth-sume some engine oil during normal its pistons, piston rings and cylinder walls er obstructions. engine operation. The causes of oil consumption in a normal engine are as have not become conditioned.
If you smell exhaust fumes in the vehicle, drive with the windows follows. When judging the amount of oil con-
Oil is used to lubricate pistons, piston sumption, note that the oil may become open and the back door closed. diluted and make it difficult to judge Have the cause immediately locatedrings and cylinders. A thin film of oil the true level accurately. and corrected. is left on the cylinder wall when a pis- ton moves downwards in the cylinder.As an example, if a vehicle is used for High negative pressure generated whenrepeated short trips, and consumes a nor- the vehicle is decelerating sucks somemal amount of oil, the dipstick may not of this oil into the combustion chamber.show any drop in the oil level at all, even This oil as well as some part of the oilafter 1000 km (600 miles) or more. This film left on the cylinder wall is burned is because the oil is gradually becoming by the high temperature combustion diluted with fuel or moisture, making it gases during the combustion process.appear that the oil level has not changed.
Oil is also used to lubricate the stems The diluting ingredients evaporate out of the intake valves. Some of this oilwhen the vehicle is then driven at high is sucked into the combustion chamber speeds, as on an expressway, making it together with the intake air and is appear that oil is excessively consumed burned along with the fuel. High tem-after driving at high speeds. perature exhaust gases also burn the oil used to lubricate the exhaust valve stems. 138



 2003 CELICA from Aug. ’02 Prod. (OM20809U)

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