E280CDI Sport Est., CLK 200k Cab., VW T5 174, Citroen C8, and a 2CV!
No particulate filter on the 270, so any semi or full synth would do. The handbooks are notoriously vague on this as they have to cover a multitude of engines with one book. If in doubt, give your VIN to your local MB dealer for his advice.
Definately do not use a 'semi' oil. The Assyst allows a service interval of around 13k+ miles....only use a good quality fully synthetic such as Mobil, which is who MB recommend.