Feel like I should jump in here in defense of  our German engineers-I haven't
yet heard anyone telling about the GOOD luck they have had with the original
engines! I personally service and have owned several very high mileage
waterboxers. One,a ' 91 with 180K dependable miles (ORIGINAL head gaskets-no
leaks!), an ' 85 with 190K,same dependability and original gaskets, a previous
personally owned ' 84 Westy with 180K,still doing great, and now my current '
87 Syncro Westy with 253K,gaskets replaced at 150,and still running great with
minimal oil usage!! I am SURE there must be others out there in this group.
The point is,almost ANY modern engine will go 250K if it has regular and
proper maintenance. Take care of these  boxers and they will last as well as
any asian engine. Regular oil and coolant changes with the best filters and
fluids are the key. Good luck to all!

Karl