Nothing really remarkable compared to dealer oil or Liquimoly which I used to run prior to X4. I also try to run Renewable diesel (R99) as much as possible. R99 makes the van run much quieter so can't certainly tell how X4 is working by engine noise alone. Don't plan to perform any analysis since the van gets once a year oil change and only sees 5k-6k miles per year.How is it performing for you? Have you done oil analysis? Tks