I bought a left over 2007 919 a month ago. Changed out the factory fill at 500 miles with Rotella 15 40 and a wix 51358 filter. I'm going to change again at 1000. The manual says to go 8000 miles on oil (GN4 10 30) and filter. That seems like a lot to me. I will continue to use the wix filter. But what oil and interval? I'm thinking Rotella at 3k or Amsoil at 6k. Don't care about doing uoa , rather just spend the money to change out the oil.