Question about 1989 BMW 7 Series

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My car is using a lot of oil and the mechanic insists that there is no leaks visible. what can be the problem?

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  • john h May 11, 2010

    what is considered alot of oil- how much oil per week or how many miles before adding- how many miles on car --ru seeing any blue smoke out of exhaust ----when u park is there an oil stain --if u can give some answers to these questions it would help in answering urs --biggest possible problem is that the car is burning oil

  • Donnie Wilson
    Donnie Wilson May 11, 2010

    There are many things,do you have any blue smoke on start up? or do you have blue smoke all the time, have you ever changed your air filter???

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How much is it losing? Believe it or not it is common for some cars to have significant loss through either Blow By, a fault in the emissions system--or if it's a BMW, have the positive crankcase vent valve checked, the oil seperator diaphram could be deteriorated----is it blowing white smoke?

Posted on Feb 22, 2010

  • vincent_j585 Dec 24, 2010

    98 740il Inconsistent smoke, in like a cloud, then it is gone from the rear. I am reading hope to learn and to keep cost down..I am disabled. Looks like intake gasket to oil seperator. I will start at oil seperator looks the most easiest for me. Will let you know when i find out here. Thanks.

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Leak


An oil leak that a mechanic cannot find? Find a new mechanic.

Okay, are you saying this is leaking a quart or more a month? That is a LOT of oil.
Oil does not evaporate. (Okay, yes, oil does evaporate, but so slowly that it is not going to be noticable in a vehicle). That said, the oil is going somewhere.

* Is it leaking on the ground? If so, then the oil will be visible the next day -- somewhere, either on the ground, or on some part of the frame. However, it will be visible.
* Is it a blown headgasket? If so, then the radiator fluid will be oily. Not good.
* Is it leaking into the transmission? Very unlikely, but in some applications is possible (not sure specifically about the 1999 Astro). However, this would be noticable as oil in the transmission.
* Is it blowing past the rings? If so, then the inside of the tailpipe will likely be sooty.

The oil is definitely going somewhere. I'm looking forward to hearing where!

--Mark

http://www.marksatterfield.com

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