I recently am switching my oil from T6 Rotella 5W40+ Lucas oil Stabilizer to Schaeffer 5W50 9000 Supreme Racing Oil in my FBO E85 VR30. Reason why I use Lucas oil stabilizer+ T6 5W-40 is cuz my VR30 Burns like a quart every 2-3 weeks. Living in AZ I also run my car pretty hard both on streets...