I agree with what the above member said, I'm in the same boat as you unfortunately. My timing chain guides went out on my 2002 4.6is at the end of November, I heard the sound on start-up, knew what it was and shut it off immediately. So now I'm trying to decide on getting it fixed or buying a 1st Gen Grand Cherokee SRT8, a 4.8is is not in the pic, if I leave BMW I'm gone for good. One of the first things I did was search this site for more info, there's a thread about the guides and it recommends you clean out the oil pan and the oil pump.