Oil leak as a result of too much oil - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 06-01-2019, 09:35 PM Thread Starter
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Oil leak as a result of too much oil

My dash info says "check engine oil". Last time this happened it was a quart low, so I added 1 quart. 4 miles later I had an oil leak which seems to originate under the filler cap down the front of the engine, but cannot be sure just yet. There is a good amount of oil that has leaked. Not familiar with these engines, or what would commonly 'blow' in this area...

signed, 'dumba$$'
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post #2 of 13 (permalink) Old 06-01-2019, 09:40 PM
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Clean it off and look to see where it is leaking,,,the cap , the filter housing ,,,??
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post #3 of 13 (permalink) Old 06-01-2019, 09:59 PM Thread Starter
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Thank you. Will clean in the morning and run at idle. Will hopefully ID and post a pic.
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post #4 of 13 (permalink) Old 06-02-2019, 10:45 AM
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Sometimes a grain of sand under the cap gasket can do it.
But now it is good time to check engine for blowby as well.


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post #5 of 13 (permalink) Old 06-02-2019, 11:59 AM Thread Starter
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Cleaned up standing oil pretty well. oil was sitting on the top of cam "housing" (see red in pic), and also some decent old accumulation on the piece in front right side of engine (see red in pic).

I let the engine (no longer has too much oil :-) ) idle for about 10 minutes. Will drive a mile or so in a bit.

My guess at this point is that it blew out the cap and/or around the piece highlighted in the pic.

Thank you!
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post #6 of 13 (permalink) Old 06-03-2019, 03:30 AM Thread Starter
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Apparently I was fortunate enough that the oil seems to have escaped through the oil cap and not some other means!
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post #7 of 13 (permalink) Old 06-03-2019, 06:29 AM
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^ In extremis too little oil and your engine will overheat and seize. Too much oil and you'll get a "hydraulic lock" where the pistons can't go up and down.

A less extreme too much oil can result in the pistons going up and down over-pressurizing the crankcase, pushing the oil out at the weakest spot. This should not be confused with a good old fashioned oil leak, of course.

Those dipstick level marks are there for a reason folks!

(And note to MB - there's nothing as simple and effective as a dipstick - please put them back on your engines and transmissions :-) )

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post #8 of 13 (permalink) Old 06-03-2019, 07:04 AM
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It was extreme sample, but years ago young owner of ML320 come to the forum asking why his truck will not move with engine running after oil change.
He did oil change with his friend.
Long story short, they drained transmission, while adding another 9l of oil to the engine.
Per the report the engine run on 18l of oil just fine and nothing blow.
Obviously it was not driven at highway speeds.


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post #9 of 13 (permalink) Old 06-03-2019, 09:37 AM
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^ Have you still got his contact info?

I'd like to see if he's interested in investing in my North Pole ostrich farm venture...

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post #10 of 13 (permalink) Old 06-03-2019, 03:22 PM
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2006 E350 has an engine oil dipstick ,,,use that to check the level,,,5 mins after stopping on a level surface.

If the dipstick says the level is correct and your dash tells you to add oil ,,,then there is a problem with your oil sensor.
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