zabardast in its own retail package and fantastic in OE package.
Your engine takes any of the MB 229.3 or 229.5 diesel oils if you are looking for following the dashboard flexible service system - make sure to use a fleece filter with those oils.
Otherwise any other diesel rated oil also works and if using a regular mineral one with paper filter then dont follow the dashboard, change it as required, usually good for 8000 kms at least.
Your engine was running too cold, make sure that is corrected first otherwise the ECU will overfuel the engine trying to warm it up again and again.