You got me curious Valdas.
Here is a 4 day old poll I created on s54 water pumps . Seems to be about 8% (above 100k miles) and 6.76% (below 100k miles) failure rate of s54 water pumps out of 74 s54 owners. Totalling an average of 14.8% failure rate in that population of owners
http://forums.m3cutters.co.uk/showthread.php?t=203110