Toyota 4Runner 3 III N180 owners manual page 137

text version of content this owner's manual page from owners manual to the vehicle Toyota 4Runner, year of production 1996 - 2002:

Facts about engine oil consumption FUNCTIONS OF ENGINE OIL Oil is also used to lubricate the stemsThe diluting ingredients evaporate out Engine oil has the primary functions of lubri-of the intake valves. Some of this oil iswhen the vehicle is then driven at high sucked into the combustion chamber cating and cooling the inside of the engine, speeds, as on an expressway, making it together with the intake air and is and plays a major role in maintaining the appear that oil is excessively consumed burned along with the fuel. High tem- engine in proper working order.perature exhaust gases also burn theafter driving as high speeds. ENGINE OIL CONSUMPTION oil used to lubricate the exhaust valveIMPORTANCE OF ENGINE OIL LEVEL It is normal that an engine should con-stems. CHECK The amount of engine oil consumed de- sume some engine oil during normal One of the most important points in proper pends on the viscosity of the oil, the engine operation. The causes of oil vehicle maintenance is to keep the engine quality of the oil and the conditions the consumption in a normal engine are oil at the optimum level so that oil function as follows. vehicle is driven under. Oil is used to lubricate pistons, piston More oil is consumed by high- speed drivingwill not be impaired. Therefore, it is essen- rings and cylinders. A thin film of oil isand frequent acceleration and deceleration.tial that the oil level be checked regularly. left on the cylinder wall when a pistonA new engine consumes more oil, since itsToyota recommends that the oil level be pistons, piston rings and cylinder walls havechecked every time you refuel the vehicle. moves downwards in the cylinder. not become conditioned. High negative pressure generated NOTICE when the vehicle is decelerating sucksWhen judging the amount of oil con- sumption, note that the oil may becomeFailure to check the oil level some of this oil into the combustion diluted and make it difficult to judge theregularly could lead to serious chamber. This oil as well as some parttrue level accurately.engine trouble due to insufficient of the oil film left on the cylinder wall isAs an example, if a vehicle is used for re-oil. burned by the high temperature com-peated short trips, and consumes a normal amount of oil, the dipstick may not show bustion gases during the combustion For detailed information on the oil level process. any drop in the oil level at all, even aftercheck, see “Checking the engine oil level” 1000 km (600 miles) or more. This is be-in Chapter 7-2. cause the oil is gradually becoming diluted with the fuel or moisture, making it appear that the oil level has not changed. 140

owners manual Toyota 4Runner

owners manual Toyota 4Runner - year of production: 1996, 1997, 1998, 1999, 2000, 2001, 2002 - Toyota 4Runner 3 III N180 owners manual EN