owners manual Toyota RAV4

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 ’07 Rav4_U (L/O 0701) Facts about engine oil consumption FUNCTIONS OF ENGINE OIL The amount of engine oil consumed de-IMPORTANCE OF ENGINE OIL LEVEL Engine oil has the primary functions of pends on the viscosity of the oil, thCHECKe lubricating and cooling the inside of the quality of the oil and the conditions theOne of the most important points in prop- engine, and plays a major role in main- vehicle is driven under.er vehicle maintenance is to keep the en- taining the engine in proper working order.More oil is consumed by high−speed driv-gine oil at the optimum level so that oil ENGINE OIL CONSUMPTION ing and frequent acceleration and decel- function will not be impaired. Therefore, it It is normal that an engine should con-eration. is essential that the oil level be checked A new engine consumes more oil, since regularly. Toyota recommends that the oil sume some engine oil during normal level be checked every time you refuel its pistons, piston rings and cylinder walls engine operation. The causes of oil the vehicle. consumption in a normal engine are as have not become conditioned. follows. Oil consumption: Max. 1.0 L per 1000 NOTICE
Oil is used to lubricate pistons, piston km (1.1 qt./600 miles, 0.9 Imp. qt./600 rings and cylinders. A thin film of oil miles) Failure to check the oil level regularly is left on the cylinder wall when a pis- When judging the amount of oil con- could lead to serious engine trouble ton moves downwards in the cylinder.sumption, note that the oil may becomedue to insufficient oil. High negative pressure generated whendiluted and make it difficult to judgeFor detailed information on oil level check, the vehicle is decelerating sucks somethe true level accurately.see “Checking the engine oil level” on of this oil into the combustion chamber.As an example, if a vehicle is used for This oil as well as some part of the oil page 398 in Section 7−2. film left on the cylinder wall is burned repeated short trips, and consumes a nor- by the high temperature combustion mal amount of oil, the dipstick may not gases during the combustion process.show any drop in the oil level at all, even after 1000 km (600 miles) or more. This
Oil is also used to lubricate the stemsis because the oil is gradually becoming of the intake valves. Some of this oil diluted with fuel or moisture, making it is sucked into the combustion chamber appear that the oil level has not changed. together with the intake air and is burned along with the fuel. High tem-The diluting ingredients evaporate out perature exhaust gases also burn thewhen the vehicle is then driven at high oil used to lubricate the exhaust valvespeeds, as on an expressway, making it stems. appear that oil is excessively consumed after driving at high speeds. 312



 2007 RAV4 from Dec. ’06 Prod. (OM42662U)

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