I have been using synthetic 5W/40 in my Saab 9-5 for quite a while now. Mobil-1, then Elf Excellium NF, and now Total Quartz Energy 9000. A quick visit to the Total Petroleum USA site yesterday reveals they no longer list the Quartz Energy 9000 in this weight. They have 5W/40 with a different name, but it also has far different Manufacturer specification compliances! What's up?