Looking over my records, mine(83.5 westy) were changed at 92,000km in '88 and again at 217,000km in '94, both repairs included new heads. I now have 232,000km on the odo in '99 and no leaks so the longevity roughly brakes down to- 
first set:  92,000km / 5 years
second:  125,000km / 6 years
current:  115,000km / 5 years and counting
Oddly the two repairs seem to of outlasted the factory ones. I only took possession of it at 270,000 so can't attest to driving conditions/style of previous owner. Jim

  Questions:  
  What is the furthest anyone has gone with a wasserboxer 1.9L engine without 
  a leak so bad it needed fixing?  
  And once it starts leaking how much time/mileage does it take
  until it becomes catastrophic?

  Thanks
   
  Alfred

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