"Reduce Oil Level" - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 02-12-2007, 09:30 PM Thread Starter
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"Reduce Oil Level"

Hello everyone. So I have an 02' G 500. I went to get an oil change (I didn't go to dealership but this guy who does Benz oil) and I got my oil changed etc. So the alert "to reduce the oil level". So I went back to the guy he reduced it and he showed me the oil stick and showed me where it's full and he said it is below the threshold of the stick (sorry if I don't know the name of it) and it might be the sensor that reads wrong because the oil is never the level of full but a little bit under it. He had originally filled it with 9 quarts but lowered it to 8.5 quarts. The reduce oil level light turns on usually 10 mins after i'm driving. What's up with it and why won't it turn off and is there anything dangerous about this? Will the oil reduce gradually as I drive the car more and more? I appreciate the help...thanks!
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post #2 of 4 (permalink) Old 02-12-2007, 10:18 PM
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I don’t believe in coincidence, so I’m going to “guess” your oil change guy overfilled the sump (added too much oil). It’s either that, or at the exact moment you got your oil changed, the oil level sensor failed. It "could" happen, but that would be coincidental in nature. I have a 430. According to the factory service CD (that’s where the attached picture comes from) my car holds 8 liters. Yours “may” hold more, but I’d be more inclined to believe the warning light than internet conjecture.

If you check the dipstick when the engine is cold, and it’s right at the full mark, it has too much oil in it. That’s because oil expands when it gets hot. 8 quarts expands a lot.

If you drive a car that has too much oil in the sump, typically the oil will get aerated and foamy. Aerated oil usually doesn’t supply adequate pressure to bearings (main or cam). Also, aerated oil tends to get passed through the PCV valve and back through the intake. This oil can foul plugs, but that’s the least of your problems. That’s because the oil typically doesn’t burn and gets passed out the exhaust valve to the catalytic converter. This causes the converter’s inner core to overheat. So yes, if you just drive it, the oil level will go down, but at the expense of the plugs, bearings, and catalytic converters. Basically, you really do want to get this handled sooner rather than later.

If you don’t know how to check the oil, and you don’t have any friends who know how to check the oil, then I’d recommend that you take the car to the dealer and ask them to check the oil. If the oil is overfull, they’ll reduce the level for some minor fee. Also, if it’s overfull, you may want to find someone else to change your oil next time.

Hope this helps

One last thing I forgot to mention - the oil change guy did use a fleece filter, right? Because if he didn't, you may want to consider paying the dealer to change filters too. Cheap paper filters don't hold up well with long oil change intervals.
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Last edited by MarcusF; 02-12-2007 at 10:26 PM.
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post #3 of 4 (permalink) Old 02-13-2007, 09:26 AM
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I'm going to guess your guy changed your oil by the "suck method" or else he didn't have it level when he drained it. (The fact he extracted oil suggests the former.)

Either way I'd guess he didn't get all of the oil OUT, so when he filled it (even with 8.5 quarts) it remains above the correct level.

I'm thrilled that the dipstick (not the guy, the one in your engine) appears to read correctly, but I've never heard of the sensor being wrong. I'd be inclined to ask him to extract another .5 quart, and I'll bet the level on the dipstick will be close to where it was (and still well within the full range), but the warning won't return.

And in my humble opinion, once this is resolved, you should be like the warning light and not return (to this shop).

Take care and enjoy the ride,

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #4 of 4 (permalink) Old 02-13-2007, 10:06 AM
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That reminds me a story from here about a year ago when young member used his friend for oil change.
He ended up with double amount of oil in crankcase and empty transmission
Dipstick suppose to be checked after about 1/2 to 1 HR. When mechanic checks the dipstick on engine stopped few minutes ago -it will always show slightly on lower side.
XX check the oil level on cold engine. If it is between dipstick lanes -I wouldn't worry about the light too much. In a 1000, or 2 miles some oil will burn out and the light suppose to vanish. Maybe it is just oversensitive.

Last edited by Kajtek1; 02-13-2007 at 10:26 AM.
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