Been to 2 different dealers on the SE Florida coast (like them both, one is just 2 hrs. closer) and they both had their own opinions on when to switch to synthetic. One dealer said 6000 miles, the other 12000. And some threads I've read on this site mention "not until 18000". I want to do the right thing and also want to start doing most of the maintenance myself (dropping hundreds of dollars at the dealerships is relatively easy I've found). My '04 LT has 9000 miles, I just had the oil changed and the 2 year fluid service (except for clutch, dealer said wait until 12000) and plan a 3000 mile trip. I'll do the 12k service then. Your advice is always appreciated and extremely helpful. I'm glad to be a member of BMWLT.com and a LT owner. Anyone down this way have some tech advice or skills will be happy to meet. I've only seen one other LT around here and haven't seen him again. Thanks, all.