S-Class GURU you brought up a very important point that I had overlooked !
Other contributing factors to pump failure !
Indeed, these other items need to be controlled in order to insure more life out of these pumps.
Funny how my lowly 300D keeps on going with no water pump problems !!
Meanwhile my C280 fails regardless of controlling the variables..
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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents)
*SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD