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1、机油粘度、品质、分类及作用Viscosity,quality,classificationandfunctionofengineoilIt'sgoodtoseeitfromsomewhereelseandshareitwithyouViscosity,quality,classificationandfunctionofengineoilTheoilmarkusuallydenotesviscosityandquality・Specificreadsareasfollows:I.viscosityindicationTheviscosit
2、yoflubricatingoilismoremarkedwithSAE・SAEistheabbreviationof^AmericanAssociationofAutomotiveEngineers'・Forexample,SAE40,SAE15W-40,SAE50orSAE5W-40,saidwinter(winter),thenumbersinfrontthesmallertheoilviscositymoredilute,betterliquidity,representingtheavailableenvironmentalte
3、mperatureislow,thebettertheprotectionabilityoftheengineduringthecoldstart:(ahorizontalplaneback)isthenumberofoilhightemperatureresistanceindexvaluethegreatertheprotectiveperformanceisbetterinoilunderhightemperature・Higherviscosityoftheengineoilonthemovementoftheresistanee
4、isrelativelyhigh,notonlythepowerconsumption,increasefuelconsumption,butalsoeasytooxidationofoil,affectingcoldstartprotection.LikeSAE40,SAE50,onlyonesetofvaluesissingle一gradeoil,notusedincoldwinters・TwosetsofvaluessuchasSAE15W-40andSAE5W-40have15,whichmeansthatinwintertheo
5、ilviscosityis15,and40indicatesthatthesummeroilisequivalenttotheviscosityofNo.40oil.Thismeansthatthiskindofengineoilisadvaneed，zmultistageengineoil",suitableforawiderangefromlowtemperaturetohightemperature,andtheviscosityvaluewillbegivenfullprotectiontotheengineasthetemper
6、aturechanges・(SAE)applicableambienttemperature(DEGC);5W-30degreesC10W-25degreesC15W-20degreesC20W-15degreesC3030degreesC4040degreesC5050degreesCAdvantagesofmultigradeoil:1.usethroughouttheyeartoprolongenginelifeandreducewear(reducewearcausedbycoldstart);2.improvefuelecono
7、my;3.reducetheconsumptionoflubricatingoil;4.wearless;1.providegoodlowtemperaturelubrication;2.longeroilchangeperiod;3.mostheavydutyenginemanufacturersrecommend・TheclassificationofoilmarketexistingaccordingtotheSAEmethod,singlelevel:thereare6kindsofoilusedinthewinter,summe
8、roil4,multistageoil:thereare16kindsofgenericsummero订.Thewinteroilbrandsare:OW,5W,1OW,15W,20W,25W
