Originally Posted by KrustyKustom

I have a 2011 GL350 that I have owned since 2012 and 27k miles. I am super diligent about maintenance and keeping an eye on things and few months ago I had an abrupt oil consumption situation arise. This motor with now 142k on it has never used a drop, then it went to a quart every 500 miles. I stopped driving it since it has a dpf filter and did not want to pump oil down the exhaust. After checking the air filters and a visual check of the turbo I decided to focus on the crankcase breather and see if it could be allowing vapor to enter the intake side of the turbo. In looking in the intake charge cooler lines there appeared to be more oil than typically seen. (Some is normal). I removed the breather diaphragm on the back of the head and this is the updated version which seals around the centrifugal separator on the cam rather than the valve cover mounted version. In comparing the new vs old I think with this design if that seal gets hard it will suck oil straight into turbo intake .
I have replaced the breather and routing the lines to the turbo intake through a Mann/Hummel ProVent 200.

Hopefully this does it, will update the post as I get some miles on it.

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