I've read about a flash you can get for slow engine warm up and now I'm paranoid my 600 is taking to long to get warmed up. In 75 - 80 degree weather, driving conservatively it takes my truck around 10 minutes or 4 miles of city driving to warm up completely. During the winter I don't think it will ever warm all the way up on the way to work. Does this sound about right? How long does it take others to warm up? My truck was built in late May of this year.