A puff of white smoke out the tail pipe in the morning is a sure sign of worn valve seals allowing oil to seep past the valves into the combustion chamber when the engine is not running.
This is a sign of a high mileage engine. Allow a few days for LUCAS ENGINE OIL STOP LEAK to correct this problem. To keep this problem corrected a quart will probably have to be added with each of change.
地上也没看到油。如果要换valve gasket费时费工，如果放些添加剂之类，不打开overhead能把gasket膨胀开吗？
搜了下，找不到什么产品呀。用high mileage engine oil听说要很多次换油才有效果的。
他要2000刀。我自己看，确实漏，但是哪个10年的车不漏油呢？为防止问题扩大化，就想能不能有省事的办法搞搞。
什么车子啊。youtube上有很多类似换valve cover gasket的视频， 参考一下吧。
http://www.carid.com/lucas-oil/engine-stop-leak-32-oz-mpn-10278.html?gclid=CMjJlb773MwCFQsPaQod4fEG0w
统一思想认识，到底是那里漏？漏的有多快？
在车下面用手电照，可以看到有一点从overhead渗出来。在车里闻不到味，地上也没有任何痕迹。
打开overhead很费工，里面还有sensor。人家不是说过吗，车的毛病都是修出来的。所以不想干呀。
上面说：
In gasoline engines:
A puff of white smoke out the tail pipe in the morning is a sure sign of worn valve seals allowing oil to seep past the valves into the combustion chamber when the engine is not running.
This is a sign of a high mileage engine. Allow a few days for LUCAS ENGINE OIL STOP LEAK to correct this problem. To keep this problem corrected a quart will probably have to be added with each of change.
它说的是往里面渗，我这车是透着rubber gasket往外渗。嘿嘿。
如果还想再开100-150K迈的话，再加点把stem valve seal最好也一起换过。
因为换stem valve seal那些个gaskets都是顺便包括火花塞。没有重复劳动费用。
您说的这个车铺子我不知道唉。
前owner刚换过这个，有收据$1100
漏，自己要能换还可以，dealer那里是挺贵，那个我上面提到的是8万买换的；漏的程度应该是还可以忍受；
看看视频不是很难
换valve cover gasket 应该不难。
it worked for my old car.
漏油是小事，关键是漏真空，车震，特不舒服。
http://bbs.wenxuecity.com/auto/418833.html
应该能帮上忙。
parts 要200 -300，自己干准被两天吧
http://repairpal.com/estimator/bmw/750li/valve-cover-gasket-replacement-cost
不放心的話，用膠布之前先用環氧樹脂塗一層在鋸開處，這叫做懶人簡易修車法
没准堵住的不是漏的地方而是细小的油道。