I have a 2005 E320 CDI and was curious what sort of oil brand this engine runs best on. I've used Mobil 1 for diesels, but have heard that the Liqui Moly is superior and was designed for this engine. Any thoughts on which one is better?

 

I use 10w40 of liqui moly and I haven't noticed any difference, I was using Mobil Delvac 5w40 before. My car consumes 1 litre oil after every 5000 km and its a high mileage car 215k (km) on the clock.