^^ that was the problem. I remember a good number of 740 and 540 equipped cars came through the shop and the only BMW tech made a killing off the work. He had it down to a science after the second or third engine replacement.

If I recall they only sent a short block. Don't remember if it came with new pistons and such.

But you could definitely tell which engines had the problem and which didn't. They tended to have less power and knocking noises.