Question about 2002 BMW 5 Series

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Starting using oil abt 125K miles, abt 1 qt per 1200 mi. Dealer recommended repl PCV valve and hoses which we did. Repair had no effect and car now using abt 1 qt every 800 miles. No leaks detected.

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  • waltjw Oct 12, 2010

    Thank you for your diagnosis. I do not see any smoke and I do not see any indication of a leak so I assume one of your faults is the problem. Engine is quite, i.e. no valve tap noise..... does that indicate it's not related to valves? Is trying an additive that is designed to reduce oil consumption advisable? Thanks again. Walt

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Is the car smoking blue or is the oil leeking out ?

if the is consuming oil by buring it while driving the faults are either :

Valve seats / Burnt valves
Piston Rings
or sump compression which can force oil into the combustion chamber causing it to burn it and expel the burnt oil via the exhaust system.

Either way, its going to pretty expensive on a 2002 5 series.

Posted on Oct 11, 2010

  • Uwe Klopfer
    Uwe Klopfer Oct 13, 2010

    Burnt vales or worn valve seats will not make any new or strange noises.

    Unless something major is broken or about to break the only sound an older engine or higher mileage motor will make it a tapping sound for a little while when starting, this indicates valve lifters and is not much to worry about, the reason it goes quiet later is because lubrication is not yet 100 % there yet (when a car is switched off all oil runs to the bottom.)

    You oil consumption is quite low so it will not be enough to make the exhaust pour out blue smoke, but it always good to be aware of what color (you should not see anything if everything is OK) the exhaust gasses are.

    Adding an additive that reduces oil consumption is an option, however I personally wouldn't advise it.

    the additives change the properties of the oil, including viscosity and lubrication properties.

    Your oil consumption is low, and a little oil that gets consumed by the engine will lubricate the top of the cylinder and valve seat etc. So its beneficial in a way. Your biggest risk is carboning up, however if you have it service regularly this won't be a problem.

    what you can ask for, is next time you take the car for its service is to ask them to perform a compression test on all cylinders.

    This may identify a problem related to your oil consumption.

    So in the meantime just make sure your oil is always topped up and you have nothing major to worry about.

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You may try replacing the PCV valve and ensuring the valves are adjusted properly.

Also, try a different oil - maybe a different weight may help.

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Go look on the Hyundai/Kia forums for oil consumption, too. You might come across something specific to your model.

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But, your case is a little more serious.

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You might want to try one of those slower burn oils designed for cars with 75,000 mi. and above. That might slow the burn off of oil down to acceptable levels.

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