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Have 2001, 740i sport with 157K on it. I have had my value cover gasket replace, and the oil pan checked and rechecked, but its burning oil. In the morning, when I start it, there is a slow existing of smoke from the exhaust (sometimes large, some time small). I was told the smoke would go away after a while. It has been several weeks, since my last oil change and I have burned several quarts of oil over this period. It was due to cleaning foam introduced to the system due to sludge build-up. I am finding out now that the built-up sludge on the values (discovered during the gasket change) may due to the constant burning or leakage of oil. I cannot seem to find the problem. Two automotive shops have looked at the car, nothing yet.

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I am amazed that two different auto shops have not understood a basic problem. The oil scrapper rings of your Beamer have worn out. They need replacement immediately. What happens is that when the pistons move bottom to top, the cylinder walls are lubricated (a very thin layer of oil but oil none the less) and when they move down this oil scrapper ring scraps this thin layer of oil and all is well. Now let us assume that this ring has worn out. The it will not scrap oil as effectively as it should have. and leaves some oil behind which gets burnt due to the explosion of gas in the cylinder and produce smoke. (It must be a black smoke if you have noticed). That is why you have been pouring oil into the engine. Although 157K is not very much for the beamer but it has happened. So, I would advise you to talk to the auto shop on these lines and get the oil scrapper rings changed. All the best to you.

Posted on Sep 29, 2010


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