Whats the approximate mileage for replacing a clutch? Is it above 100,000 miles or what? Something odd has been happening to me lately. Sometimes when I am shifting the engine keeps revving after I let go of the clutch. This is the process...clutch goes in, shift gear, let go clutch, hit the gas. When i Hit the gas and my foot is totally off the clutch, the engine sometime revs. It will keep revving until I let go of the gas, but after I put on the gass again it works fine. My friend was riding with me today and it happened and he said that its the clutch slipping. Its not frequent, but its totally random. I dont drive my car hard at all and its only got 64000 miles on it, 1998 318ti. THe previous owner was a lady so she didnt drive it hard either. What could be causing this weird revving noise, could it really be time for clutch replacement? How much does that cost for just a stock BMW clutch.?