Originally Posted by Doru

You can see if the sealing sleeve is leaking just by crawling under the car - it's in the back, pass side corner of the tranny and up.

Concerning the misfires, you said you owned a few BMW's before. So do I (I still have them). I know 100% that for the inlines, when the car wasn't run for a while, and if it'sparked in a cold environment, you can get the misfires, and then the CEL lights up. Then, you turn off the engine and re-start, and the car acts like nothing ever happened. It might have something to do with engine management, and it cuts off fuel supply, then once the engine is re-started, and the cylinders are bit warmer, they don't act anymore. Weird but true. Maybe the v8's have something similar going...Never happened to my X