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re:02 Water pump life span? Buy OEM?

I saw two kinds of broken waterpumps:
1. Good (not shaking) bearing, but leaking
   rear seal - i belive it's because of grease
   lack between seals.
   
2. No leaks, but bad bearing - tight belt or
   long use.

Some observations:

Gasket never leaks - it's tinny paper gasket.

If it leaks from one of two small oil holes -
rear seal is bad. Rear seal is wiered pressin
construction - not repearable.

If it leaks from under pulley - front seal is bad,
'Heynes' says you can get front seal and replace
it - take off front pulley and replace seal,
but it's really hard to belive that rear seal is
ok, but there is leak - only way for water to
reach front seal is thru rear. And it's big pain to
press out pulley connector from shaft.

So get new one. I don't think there is big price 
difference between BMW and aftermarket types.

When i got new pump, i saw that it wasn't greased
inside - better add some grease thru holes.

Oleg.
E30 M3, 75 02, 71/72/74 02, garage floor covered with
bunch of stuff that was three days ago 72 02...