They are more prone to bearing failures than other performance V8s. I don't know why. BMW just built them differently. Years ago I owned an E92 M3 that I bought with bad bearings, did the repair myself, got the car super cheap. It doesn't happen to LS7s, M156s, Audi 4.2s, none of them have bearing issues like the S62s, and not all S62s seem to be affected. It also affects S54s, S85s. As for the head gasket thing, yes it's kinda dumb, but BMW did that on many engines, M50, S38, S14, going back to the M30... It's actually not that uncommon at all, the M156 has that, as do more common engines like the nissan SR20, toyota 22RE, and I'm sure many more that I haven't had apart. BMW tried a separate gasket for the timing case (not the cover, just the rear case, which was separate on that engine) on the M42, the "profile gasket" which was rubber and had a cooling passage in it. It was a disaster. It would leak, and repairing the leak would be a head off job, very expensive. In extreme cases it would leak coolant into the crankcase. BMW's 4cyls have never been particularly good since they discontinued the M10 and S14.