车主们在换机油时;都想把车举高高的,把机油放干净。还是有车主会发现,往往加机油的时候一桶新油会剩下一些加不进去,不同的车剩下的量不同,有的多有的少。那是不是4S店放油没放干净呢?
关于这个问题有两种原因:
第一,无论在哪里换,机油都是靠着重力自然流出来的。而由于机油出口角度和油底壳不规则构造的原因,总有那么一部分机油是无法自然流出来的。因为机油长时间使用,有很多杂质,无法彻底放干净。举个例子,一大盆水里面放上沙子,然后在盆底钻个洞,你会发现总有一部分水和沙子无法流出去。机油也是同样的道理,打开油底壳就能看到,例如曲轴、连杆上面仍存有部分机油,这些机油是不能依靠重力放干净的。而且,在4S店比较忙时,不会给你放很长时间机油,这样旧油多了,新油就加的少了。所以机油剩一点也很正常。
还有就是,发动机润滑有很多方式,部分部位由于机械构造原因无法正常依靠机油道润滑,只能依靠曲轴平衡轴和连杆底部不断的圆周运动将机油溅到润滑区域,比如气门、顶柱、缸壁等,如果全部放干净了,反而启动时候会损伤到发动机。
第二,有某些黑心的师傅,放机油时不放干净,把剩余的机油拿出去卖,4S店也会睁一只闭一只眼。大家买机油只有两种选择,1L装或者4L装,例如帕萨特和迈腾来说加4.8L,还剩200ml,多了的200ml就被留了下来,如果今天正好来5辆帕萨特保养,这不是正好凑了1L,顿时1瓶装有了。换速腾,只要来两辆就可以凑1L了。所以,那些到店保养直接把钥匙一扔看也不看的车主,你们是不是觉得有些膝盖疼?然后多出来的1L就可以拿去出卖,但是并不是所有修车师傅都这样,毕竟是少数。
机油放不干净会不会对发动机损伤?
上面已经说了机油靠重力是放不干净的。对于剩下的旧油会不会损伤发动机才是车主关心的。其实大家根本不用担心,机油有清洁、润滑、冷却、防腐、密封等作用,发动机内部磨损所产生的金属碎屑可以随着机油的循环留存到油底壳里面,因为油底壳机油泵在将机油向发动机上部输送的同时会对机油进行过滤,然后机油才会进入润滑油道,所以对发动机内部不会有损伤。
机油在发动机工作中受到燃料燃烧温度的影响和各种介质、金属的催化作用,逐渐变质老化、产生积碳、漆膜和油泥等对发动机有害的各种物质,所以要定期清理润滑系统、清理残余机油,才能保证发动机的“健康”!
那么关于剩余机油该如何保存?
机油变质原因:
水分:正常情况下机油中的含水量在0.03%以下,当含水量超过0.1%时,机油中的添加剂就会失效,加速机油的氧化过程。而机油氧化生成的有机酸及发动机排出废气中的酸性氧化物与水发生反应,又生成无机酸。这些酸性物质增加对发动机的腐蚀。
然后是氧:氧也是影响的机油中的各类添加剂,而且别以为只有好机油添加剂才多,什么机油里都有添加剂。尤其是在阳光照射或者高温的情况下,空气中的氧气与机油的反应更快。
还有就是杂质:杂质主要影响机油的清洁度,机油中混入杂质后会影响机油的润滑效果,甚至导致发动机异常磨损,进而影响其密封性能,甚至烧机油。
如果车主将这种变质机油加注到车辆中,那么发动机内需要润滑及冷却的部件将得不到足够的保护,发动机的负荷及磨损就会加剧,最终造成发动机损坏,以至于提前大修。
保存方法:
1、用一层塑料膜罩在机油的瓶口,然后把机油瓶盖拧上。注意保持瓶口密封性,选用较厚的塑料膜。
2、把密封好的机油放在阴凉干燥的地方,这样可以避免机油发生氧化反应变质,例如墙角。当然还有很多车主喜欢放在后备箱,也是可以的,以备不时之需。
原创文章,作者:cesifu,如若转载,请注明出处:http://www.cesifu.com/article/44261.html
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