[jclark003]

Highly recommend you go to boat diesel.com. There is a lot of posts regarding engine reliability, costs, etc including known issues by brand. Mann has had their fair share of issues over the years (as with other brand/models) but specific to those engines i couldn't answer. Generally I was always under the impression that all things equal, Mann are a fair bit higher to maintain than Cat or Cummins. Your true cost of ownership will probably be more dependent on how hard the engines have been run, how well they have been maintained and propped, etc.