Oil has been changed religiously since he bought the car @ 25k mi, w/ solid record before hand. The gear and chain on the oil pump on a 602 motor are not neary as beefy as those on the 617's and others.
C'est la vie, I guess....

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress