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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Oil backing up through the hole where the old dipstick goes. some kind of pressure problem

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I recently bought a 2003 Santa Fe. It's burning a quart of oil every 1,000 miles.

If you do some more research you'll see that 1 Qt per 1K miles is considered acceptable, as the dealer stated....not that I agree either!

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.

I WOULD replace the O2 sensor as it can affect the amount of fuel that is used and may actually dilute the oil if it's getting past the rings.

Just to ensure the engine is healthy you can get a Compression and Leakdown test down. This will tell you the 'health' of the engine.

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


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Sounds like you either have a problem with the rings, or a PCV valve leak. Being an engine that is what 15 years old? It could go either way. I would start with pulling the hose off the PCV valve and making sure that no oil is being allowed to get into it. If so, then you have found a bad valve. Those are cheap. A set of rings on the other hand..?? Anyways, Good luck, and if it is the PCV valve leaking oil into the cylinders then make sure to change the spark plugs.

Something else that will cause it is just plain using the wrong oil for the engine.. So you will want to look into that.

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My engine loses 1 qt of oil every thousand miles. i have no leaks or smoke from exhaust pipe

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But, your case is a little more serious.

I think that it's probably leaking past the rings and/or valves and the catalytic converter is eating up the oil, so you see no blue smoke, like you would in a car that has no converter (I'm assuming you have a catalytic converter on your car as my 1981 Honda had).

After 100,000 mi. little irregularities in the piston cylinders can develop, and seals can gradually degrade. So, this is normal for that kind of mileage, although there are people who get over 400,000 mi. on their cars with just regular maintenance and driving highway mi.

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.

Good luck with it.

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