推荐回答（1个）
这是一个综合衡量机油质量高低的标准,油质量由低至高依次划分为:SA、SB、SC、SD、SE、SF、SG、SH、SJ、SL等级。SL是目
前世界品质级别最高的机油。
SA 1930 年代初期，纯矿物油，不含添加剂．
SB 194O 年代后期，首只含添加剂的机油，含有些防锈剂及防氧化剂．
SC 1964 提供防止高温及低温沉积、磨损、锈蚀及腐蚀的保护．
SD 1968 表现比SC机油好．
SE 1972 更多防止氧化、锈蚀、腐蚀及高温沉积的保护．
SF 1980 氧化稳定性较SE为佳．
SG 1989 对发动机沉积、机油氧化及发动机磨损的控制较SF为佳．
SH 1993 测试通过程序较SG严格．
SJ 1996 世界顶级机油．
SL 2002 SJ级别的升级版本
二.是SAE 标准(即"美国汽车工程学会"标准) 。
这是衡量机油粘度的标准 , 又分为单式粘度和复式粘度。例如: SAE40 (单式粘度) , SAE15W-50(复式粘度)。在复式粘度中,W即冬天的意思 ,
W前数字越小机油越耐低温 ; W后面的数字越大 , 高温油膜保持能力越好。
目前,正规的润滑油生产厂家生产的机油基本上都是按照这两个标准来划分等级的。所以,其产品的包装外壳上都
壳上注有"SF", 则SF级别以上(含SF)的机油都可以使用。当然,机油级别越高,价格也越贵。
要求(有的甚至最低要求都达不到)。如果你知道了机油划分等级的两个标准,经济条件又允许的话,完全可以选用更高级别
的机油,这样对发动机的养护更加有利.而不必迷信那些所谓的"专用机油"。
最后注意的是,机油最好选用正规厂家生产的正品机油。个别不法厂家商为谋取暴利，虚标机油的等级,甚至用回收的废机
油进行二次生产,以次充好。机动车使用了这种劣质机油后,发动机的磨损会加剧
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