Hi all brand new here and have an annoying problem with my 2009 E350 W212 Bluetech.
The car developed an oil leak identified as oil cooler seals all seals were changed including turbo.
One week later another oil leak identified as rear crank oil seal this has been changed however the oil leak persists can anyone shed any light on the problem.
many thanks
jtw73

moved to W212 forum...

Your engine has a high blow-by that needs to vent out
Stop just getting seals replaced.... instead seek the root cause.
Have the cylinders inspected for physical damages and individual compressions measured to assess cylinders wear (never mind leaky valves here).

I am going to guess you have worned out piston rings caused by poor marginal lubrication. This cylinder refurb can still be done before a catastrophic failure takes the engine out.

Have you ever found your dipstick popped out before ??

And replace the PCV system. These components plug over time with oil sludge and cause increased crankcase pressure which leads to oil leaks.

Many thanks for your reply, looks like its the sump. leak is from rear left hand corner i understand Mercedes don't fit gaskets !! anyway its in the shop next week.

Many thanks for your advice, leak has hopefully been identified and its in the shop next week
jtw73