I have a 91 bmw 850i and for the last 6 months the clutch seems to be slipping slightly. The stange thing is it hasn't gotten any worse during the last 6 months. It doesn't slip in 1st or 2nd gears or at higher rpms 3,000 and up. It does seem to slip when putting it into 3-6 gear at a low rpm (below 2,500) and only if I try to give it a lot of gas will in a low rpm. At first I was going to replace the clutch, but 6 months later it's still very drivable. I don't smell anything burning even when it slips. I was woundering if it could possibly be anything besides replacing the clutch.