owners manual Toyota Camry

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 ’05Camry_U (L/O 0409) Facts about engine oil consumption FUNCTIONS OF ENGINE OIL
Oil is also used to lubricate the stemsWhen judging the amount of oil con- Engine oil has the primary functions ofof the intake valves. Some of this oilsumption, note that the oil may become lubricating and cooling the inside of theis sucked into the combustion chamber diluted and make it difficult to judge engine, and plays a major role in main-together with the intake air and isthe true level accurately. taining the engine in proper working order.burned along with the fuel. High tem-As an example, if a vehicle is used for ENGINE OIL CONSUMPTION perature exhaust gases also burn therepeated short trips, and consumes a nor- oil used to lubricate the exhaust valvemal amount of oil, the dipstick may not It is normal that an engine should con-stems. show any drop in the oil level at all, even sume some engine oil during normal The amount of engine oil consumed de- after 1000 km (600 miles) or more. This engine operation. The causes of oil consumption in a normal engine are as pends on the viscosity of the oil, thise because the oil is gradually becoming follows. quality of the oil and the conditions thediluted with fuel or moisture, making it vehicle is driven under. appear that the oil level has not changed.
Oil is used to lubricate pistons, piston More oil is consumed by high-speed driv-The diluting ingredients evaporate out rings and cylinders. A thin film of oil is left on the cylinder wall when a pis- ing and frequent acceleration and decel- when the vehicle is then driven at high ton moves downwards in the cylinder.eration. speeds, as on an express way, making it High negative pressure generated whenA new engine consumes more oil, since appear that oil is excessively consumed its pistons, piston rings and cylinder walls after driving at high speeds. the vehicle is decelerating sucks some of this oil into the combustion chamber.have not become conditioned. This oil as well as some part of the oilOil consumption: Max. 1.0 L per 1000 film left on the cylinder wall is burned km (1.1 qt./600 miles, 0.9 lmp. qt./600 by the high temperature combustion miles) gases during the combustion process. 219



 2005 CAMRY from Sep. ’04 Prod. (OM33684U)

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