Burning Oil Odor - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 08-04-2019, 11:28 AM Thread Starter
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Burning Oil Odor

After a routine service by the dealer, I started smelling burning oil while driving. The odor would come after driving for a while and would come and go. I checked the oil level and it was way overfilled. I did not get any warning light. I went back to the dealer and they removed some oil. I am still getting the smell but not that strong. The dealer says everything is fine.

Any suggestions?
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post #2 of 9 (permalink) Old 08-05-2019, 02:48 AM
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To over fill the engine with to much oil is bad . And the oil will push though the engine seals .Report it to the service depot top notch tell him you think they have damaged your engine by overfilling it .The extra oil will get out of any gaps it can find.
My friend had to purchase a new engine after he over filled his . He did this by putting a full tin of oil in to the engine he had done it like this for years . But this time the new tins had 50% extra them , this time he never looked on the containers and just put the contents right in. This cost a new engine clutch and radiator . Not happy as the car was only 3 years old at the time. Get another garage to look at it for second opinion ,, i would. Sad to hear and good luck .
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post #3 of 9 (permalink) Old 08-05-2019, 09:42 AM Thread Starter
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The dealer said that on my car, warning comes on if there is too much oil. However, no warning came and I could see the oil was overfilled even when the engine was cold. I have only 15K miles on the car
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post #4 of 9 (permalink) Old 08-06-2019, 12:16 PM
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How far above full was it. Generally on a dip stick from low to high is around a litre. They may of spilt some filling it and once the engine is warm you can smell it. Either way itís not really acceptable from any shop.


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post #5 of 9 (permalink) Old 08-06-2019, 09:23 PM Thread Starter
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The oil level with the car sitting overnight, completely cold, was way over the MAX mark. The whole brown level indicator (I am not sure what it is called) was completely immersed in oil and then some.

Now that I have driven for some time after the dealer removed the excess oil, there is no odor any more.
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post #6 of 9 (permalink) Old 08-07-2019, 02:15 AM
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Just wait for the crunch ,..But i hope not .
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post #7 of 9 (permalink) Old 08-07-2019, 02:04 PM Thread Starter
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Originally Posted by plinker17722 View Post
Just wait for the crunch ,..But i hope not .
Can you elaborate? What could be potential problems. The car is running fine with no odor.
Thanks,
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post #8 of 9 (permalink) Old 08-10-2019, 12:26 PM
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Quote:
Originally Posted by plinker17722 View Post
To over fill the engine with to much oil is bad . And the oil will push though the engine seals .Report it to the service depot top notch tell him you think they have damaged your engine by overfilling it .The extra oil will get out of any gaps it can find.
My friend had to purchase a new engine after he over filled his . He did this by putting a full tin of oil in to the engine he had done it like this for years . But this time the new tins had 50% extra them , this time he never looked on the containers and just put the contents right in. This cost a new engine clutch and radiator . Not happy as the car was only 3 years old at the time. Get another garage to look at it for second opinion ,, i would. Sad to hear and good luck .
This is nonsense. The extra oil in an overfilled engine doesn't "push through the engine seals" and "get out of any gaps it can find".

The reason an overfilled engine fails is due to foaming of the oil. When the oil pan is overfilled, the oil level can actually reach high enough to contact the bottom of the crankshaft which sits right above the pan.

The rotation of the crankshaft while the engine is running will come into direct contact with the surface of the oil and cause a whipping effect which introduces air into the oil.

This foaming of the oil reduces it's viscosity since the oil pump is now also pulling through foam and air bubbles into the engine. This lack of lubrication is what kills the engine.

For the OP, I'm sure the reason for the oil burning smell is simple. When they were draining the old oil, removing the old filter, or pouring the new oil into the engine, they likely spilled some of the oil onto a part of the engine or exhaust that gets hot enough to burn it. I've done that as a DIY and the smell does go away eventually as you continue to drive the vehicle.
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post #9 of 9 (permalink) Old Today, 11:26 AM Thread Starter
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Thank you for the explanation. Makes sense. I still get burning oil smell after driving for a while. The smell is not so strong as it used to be.
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