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I was at a Cat training seminar where the topic of low RPM running came up, mostly in sport fishing yachts trolling. They went in depth of the issues they were facing in trying to produce an engine that can troll for a long time and still be powerfull enough for high speed travel. They showed pictures of the damage from long term trolling and running at low load. The answer is definetely YES.. running at low load can hurt your engine.
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