2005 Mercedes E320 CDI engine oil choice

[edyvw]

Cf is a very old rating and not applicable to anything built in the last 40 years or so.

It is not aplicable bcs. emission standards. It still does its job dealing with soot etc.
However, that is in ADDITION to current light diesel standards ACEA B4-12 and B4-16.

 

[BrendanC]

decided on some Premium HDEO CK4 5w-40