owners manual Toyota Yaris

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04 05.18 Facts about engine oil consumption
Keep the back door closed while FUNCTIONS OF ENGINE OIL
Oil is also used to lubricate the stems driving. An open or unsealed backEngine oil has the primary functions ofof the intake valves. Some of this oil door may cause exhaust gases to lubricating and cooling the inside of the is sucked into the combustion chamber be drawn into the vehicle. engine, and plays a major role in main-together with the intake air and is taining the engine in proper working order.burned along with the fuel. High tem-
To allow proper operation of yourENGINE OIL CONSUMPTION perature exhaust gases also burn the vehicle’s ventilation system, keep oil used to lubricate the exhaust valve It is normal that an engine should con-stems. the inlet grilles in front of the wind- shield clear of snow, leaves, or oth-sume some engine oil during normal The amount of engine oil consumed de- er obstructions. engine operation. The causes of oil pends on the viscosity of the oil, the consumption in a normal engine are as quality of the oil and the conditions the
If you smell exhaust fumes in the vehicle, drive with the windows follows. vehicle is driven under. open and the back door closed.
Oil is used to lubricate pistons, pistonMore oil is consumed by hig−hspeed driv- Have the cause immediately locatedrings and cylinders. A thin film of oil and corrected. is left on the cylinder wall when a pis- ing and frequent acceleration and decel- ton moves downwards in the cylinder.eration. High negative pressure generated whenA new engine consumes more oil, since its pistons, piston rings and cylinder walls the vehicle is decelerating sucks some of this oil into the combustion chamber.have not become conditioned. Oil consumption: Max. 1.0 L per 1000 This oil as well as some part of the oil km (1.1 qts./600 miles, 0.9 lmp.qts./600 film left on the cylinder wall is burned by the high temperature combustion miles) gases during the combustion process.When judging the amount of oil con- sumption, note that the oil may become diluted and make it difficult to judge the true level accurately. 102 2005 ECHO HATCHBACK from Jul. ’04Prod. (OM52624U)

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