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A while back I posted a thread on "The Waddington Effect". That is, the over maintenance resulted in higher not lower failure rates. The article below expands upon that with some interesting statistics. The question for us with boats is this. Are we "inspecting and repairing as necessary" aka IRAN or are we just replacing things because, "it is a good idea". What things can fail and not endanger you and what things are a must. Further, how do you inspect to spot the failure points? For instance, how may do oil analysis versus "early and often oil changes".
I have a single screw stern drive. I do oil analysis. It just saved me some big bucks. At 400 hours I started to see high copper levels. An analysis of the copper revealed it was from the oil cooler. Cooler replaced. Oil now normal. If it had failed it would have put water in the oil. No amount of early oil changes would have solved that problem and indeed early oil changes make oil analysis difficult.
http://blog.aopa.org/opinionleaders/2014/02/11/roots-of-rcm/#comments
I have a single screw stern drive. I do oil analysis. It just saved me some big bucks. At 400 hours I started to see high copper levels. An analysis of the copper revealed it was from the oil cooler. Cooler replaced. Oil now normal. If it had failed it would have put water in the oil. No amount of early oil changes would have solved that problem and indeed early oil changes make oil analysis difficult.
http://blog.aopa.org/opinionleaders/2014/02/11/roots-of-rcm/#comments