But with the octane mystery, no BMWNA answers, and several wierd occurrences within the past three days (engine not starting, radio not working, a punctured tire, and inability to get out of my car through either front door)... I am thinking of getting my trouble-free Jag XK8 out for winter duty. It has never let me down. The X5 is beginning to remind me of early Jags...great when they work.