润滑油15W-40CD柴油机油与和20W-50CD柴油机油有什么区别
推荐回答（4个）
等级越高的油越好，柴油机油还有CF-4，CH-4等，这样的机油比CF，CH的好就：CF-4比CF好选用油品粘度圆则时不罩让要以为也是越高的粘度越好，油品粘度应随当地气温选用 粘度级别 适用的气温范围，℃ 季节 我国地域 30 0～+30 夏季 东北西北 40 0～+40 夏季 全国各地 50 +5～+50 夏季 南方 5W/30 -25～+30 冬夏通用 东北西北 5W/40 -25～+40 冬夏通用 东北西北 10W/30 -20～+30 冬夏通用 华北、中西部 10W/40 -20～+40 冬夏通用 华北、中西部 15W/40 -15～+40 冬夏通用 华北、中西部 20W/50 -10～+50 冬夏通用 黄河以南 长江以北
机油的粘度:适合的粘度是磨擦表面建立油膜的首要条件，粘度大，则流动性差，起动瞬间更易磨损，粘度低则润滑不足，发动机运转后，也会造成磨损。一般来讲新车和新大修的车应使用粘度较低的机油，特别是刚大修的车辆磨合期内一定不要使用粘度过高的机油，因为这时的发动机各部分配合间隙很小，粘度高的机油流动性又不好，这样就会导致发动机散热及润滑不良，使润滑油老化加快，发动机磨损加剧。环境温度:应根据所在地区的气温来决定机油的粘度。一般来说冬季应选用复式粘度的机油保证机油的低温流动性能。夏季主要是考虑机油的橘闷棚粘度保持，因为夏季温度较高粘度太低的机油不能保持足够的机油压力，使发动机得不到润滑。 很多润滑油厂商通常在成品油瓶的不干胶上标明：高增压，重负荷！！本品采用美国进口添加剂，进口基础油等等，，其实那是假的，，一般的油用的添加剂都是国产的，基础油也是，只有那些高等级的才是进口添加剂调炼出来的！高增压，重负荷在很多柴油机油上都有写，其实都一样的，比如：CD 20-50 高增压，重负荷跟普通的CD20-50都是一样的！
没那么复杂，主要区别是黏度等级
15W-40CD的黏度在13.5～16.0之间，倾点在-25℃左右态掘镇。
20W-50CD的黏度在16.5～帆粗20.0之间，倾点在散前-19℃左右。
如果你的车载重较高用20W-50，如果普通就用15w-40
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