First pull of the dip stick was bone dry

Here's how it works, when the engine is running the oil level in the pan is lower than when the engine is off. Some air gets trapped in the dip stick tube. When you shut the engine down, all the oil drains back into the pan and fills. However, that tiny bit of air in the tube keeps the oil from rising up the tube. So, when you pull the dipstick the first time it may be dry or low. The second time, the air is cleared, the oil rises up the tube and you get a reading on the second dip.
You can check this out w/a pan of water and a straw.

Here's how it works, when the engine is running the oil level in the pan is lower than when the engine is off. A little bit of air is trapped in the dip stick tube. When you shut the engine down, all the oil drains back down to the pan. However, that tiny bit of air in the tube keeps the oil from rising up the tube. So, when you pull the dipstick the first time it may be dry or low. The second time, the air is cleared, the oil rises up the tube and you get a reading on the second dip.
You can check this out w/a pan of water and a straw.
The Best of Mercedes & AMG
...yes, our car appears to have a digital warning for when the oil level drops below a minimum threshold. I found it on pg of 248 of the 2012 W212 Owner's Manual, but there not much more written about it than this.


These devices are not infallible. It is also note on page 248 of the 2011 E350 manual
In the this manual it says - on page 309 - that the engine will consume up to as much as 0.9 US. qts (0.8L) per 600 mile or 1000 km depending on driving style. I am not one to baby the car and my annual mileage is about 14000 km. I have never had to add oil between service intervals that seem to come around once a year but based on the manual I should be adding about one Liter a month. I rarely check it.
It goes on to say that the car, if at normal operating temperature, should be parked on a level surface for 5 minutes (30 minutes if you just do a quick start and shut off) then remove the dip stick entirely, wipe it clean and slowly reinsert it to the stop and slowly remove it to check to see if the oil level is between the max and min marks.
It looks like they anticipated the air lock issue in the procedure recommended.
Last edited by Alex.currie44; Feb 18, 2015 at 12:50 AM.


MB has always had tight fitting dip sticks. The transmissions in some of my cars actually had a latch on the dip stick.
I wonder if it has something to do with crankcase venting in their engines.
A little back ground: I always change my oil myself, so when the car had about 3500mile on it I sucked the oil out and I was getting only about 5 quarts or less out, so I put back about the same amount checked level and it was fine. I thought the E350 was not meant to have oil suctioned from dipstick and forgot about it. Few thousand miles later just tried to check the oil and got a dry dipstick on first attempt and proper level on second attempt. So I drained the oil completely and got the above results. Now after putting about 7.5 quarts in, the dipstick is not dry on first attempt. So for all of those, that get dry stick, try to drain and measure it to make sure that you have enough oil. I certainly didn't.




A little back ground: I always change my oil myself, so when the car had about 3500mile on it I sucked the oil out and I was getting only about 5 quarts or less out, so I put back about the same amount checked level and it was fine. I thought the E350 was not meant to have oil suctioned from dipstick and forgot about it. Few thousand miles later just tried to check the oil and got a dry dipstick on first attempt and proper level on second attempt. So I drained the oil completely and got the above results. Now after putting about 7.5 quarts in, the dipstick is not dry on first attempt. So for all of those, that get dry stick, try to drain and measure it to make sure that you have enough oil. I certainly didn't.
E350 should take 8 quarts of oil.







