cabin filters
 

question?? my 2000 mercedes e320 is getting oil smell from vents in cabin, which filter should i change first?? the canister are the white paper one, i have little knowledge of cabin filter but im now learning thanks for your help.

If you are smelling oil you should check for oil leaks. I don't know your mileage, but all of my M112 engines started to leak a little from the valve cover gaskets. Sometimes tightening the covers will slow leakage.

For outside odors, the charcoal filter should be changed. This may or may not eliminate an oil smell. I know the charcoal filters will eliminate fumes if they are working (they work great in tunnels). It is the one under the dash. it is also a good idea to change the paper filter behind the glove box as part of routine maintenance. I changed my paper filters every oil change and changed the charcoal once in 200k miles.