The engine's downfall was premature camshaft wear in some early models; both V45, 1000 and V65. In retrospect, the wear was caused by inadequate oil flow to the heads/cams driving for a long time on low rpm (under 3000) and at cold start /engine warmup procedure, non-accurate valve adjustment, and sometimes insufficient maintenance. Owners have often modified their oiling systems and successfully eliminated the wear problem, and some companies, like DRP, sell kits / oilmods to do this modification. fyi