OM 642 oil leak
Thread Starter
Junior Member
Joined: Apr 2017
Posts: 40
Likes: 4
2011 E350 blutec
OM 642 oil leak
Hello and how are you. Havent been on the forum in a while as I have had a lot going on. New troubles with the diesel and im looking for some info. I noticed my driveway was getting a few oil spots on it. I checked my oil level and it was down about a quart. Refilled it and have been monitoring it. Now its leaking pretty bad and will have to get it repaired. The entire lower half of the engine is covered with oil. I cant see where its coming from, and Im looking for some possibles. here is whats been done to the car so far-
62k miles- oil cooler
approx. 80k miles- rear main seal
110 K- crank case vent valve
I do an oil change myself on the 5 k miles, 10k miles it goes to a shop for recommended service. I drive generally in the middle lane on the New Jersey Turnpike back and fourth to work. Middle lane you need to do about 75 mph to go with the flow of traffic. And I still get passed by people in the right lane like Im driving 50 mph. Im driving 50 miles each way every day since I moved to a new house. So where would you suspect the most likely place it would be leaking from?
Q2- After replacing the crank case vent valve, I had hoped I would get less oil into the turbo. Not the case. Now Im looking at installing a Mann Provent 200 oil catch can/separator. Have any of you used this and If so how much cleaner was your intake system? Would anybody be able to tell me what hoses and fittings to use?
I would like to cut the hose on the CCVV somewhere before the air flow sensor and plumb the separator in. I also saw on a post somewhere that a guy had plumbed another hose after the separator . He had installed a T in the hose ,ran another hose to the air filter. He put a fitting in the air box on the clean side , so as not to induce dirt and debris into the intake. Doing this allowed the turbo to draw clean air into the engine while not sucking the oil out of the engine through the CCVV . The combustion gasses will still be able to be burned , but, it wont suck the oil out of the engine and into the intake system. He claimed the oil consumption went down doing this. I think he is correct.
So what type and size hose and what fittings would be ideal to do this? Thank you all for your input as it will be much appreciated, E350 cruiser Merry Christmas, Happy Haunakkahh, Happy Kwanza, and Happy new year.
62k miles- oil cooler
approx. 80k miles- rear main seal
110 K- crank case vent valve
I do an oil change myself on the 5 k miles, 10k miles it goes to a shop for recommended service. I drive generally in the middle lane on the New Jersey Turnpike back and fourth to work. Middle lane you need to do about 75 mph to go with the flow of traffic. And I still get passed by people in the right lane like Im driving 50 mph. Im driving 50 miles each way every day since I moved to a new house. So where would you suspect the most likely place it would be leaking from?
Q2- After replacing the crank case vent valve, I had hoped I would get less oil into the turbo. Not the case. Now Im looking at installing a Mann Provent 200 oil catch can/separator. Have any of you used this and If so how much cleaner was your intake system? Would anybody be able to tell me what hoses and fittings to use?
I would like to cut the hose on the CCVV somewhere before the air flow sensor and plumb the separator in. I also saw on a post somewhere that a guy had plumbed another hose after the separator . He had installed a T in the hose ,ran another hose to the air filter. He put a fitting in the air box on the clean side , so as not to induce dirt and debris into the intake. Doing this allowed the turbo to draw clean air into the engine while not sucking the oil out of the engine through the CCVV . The combustion gasses will still be able to be burned , but, it wont suck the oil out of the engine and into the intake system. He claimed the oil consumption went down doing this. I think he is correct.
So what type and size hose and what fittings would be ideal to do this? Thank you all for your input as it will be much appreciated, E350 cruiser Merry Christmas, Happy Haunakkahh, Happy Kwanza, and Happy new year.
Senior Member
Joined: Jul 2011
Posts: 328
Likes: 56
2012 S350 Bluetec 4MATIC; 2011 ML350; 2005 C230k;
Check the video below for reason why these engines have high oil consumption. Some people have successfully reduced oil consumption after they used BG 109. Oil catch can is good thing to prevent oil being sucked back to the intake but it will not fix your problem. BTW I'm dealing with this issue too.
For the oil leak, make sure your oil cooler is not leaking again. Can you at least tell whether the oil is coming from left or right side of the engine?
For the oil leak, make sure your oil cooler is not leaking again. Can you at least tell whether the oil is coming from left or right side of the engine?
