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It seems that Aviation consumer perpetuates the story line that the 337s are maintenance hogs. Indeed there are a few idiosyncratic items that do require different levels than a conventional twin but I don't think those to be of much importance when evaluating the relative maintenance needs.
From my experience of owning a Seneca III (same motors as my P337) I don't think there is much difference at all. My guess is that some compare the 337's maintenance costs to that of a single, and of course it is going to be more--but not in comparison to other light twins.
Dave Dillehay
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