I need help with selecting the best oil for my RV. I have a small RV built on a 2013 Sprinter 3500 chassis with a 3.0 turbo diesel. I recently read an article that had many bad things to say about the oil that is recommended by Mercedes. Without going into to much detail the article seemed to recommend that I deviate from the recommended oil. I am hesitant to do this since doing this would void my warranty. I am researching to find a really quality oil that still meets Mercedes 229.52. I am looking at amsoil European formula 5w40 but I am looking for advice. In the article I read it seemed that the writer who has a long history with Mercedes thought that the Viscosity index and the Noack number were extremely important. I found this forum and was hoping to get some advice. Thanks in advance for any insight you can give.