The manual suggests asking a dealer, so I thought I'd ask you.

What is the best oil to use in a 190D? What about coolant? Also airfilters....does it matter? Can I use a K&N?

 

Another Question. What type of Auto-tranny fluid do you use?

 

Just buy any good oil that is Rated of a Diesel. Rotella by Shell is a top brand used by Truck drivers and trucking companies. Expensive but worth it. As for ATF fuild i use any that is Mercon 3/Dextron whatever brand u like.