Always had a soft spot for the MixMaster

[trey kule]

337s, particularly the newer models are not anymore maintenance problems than any other twin with similar systems and age. It helps to have an AME who is familiar with the idiosyncrasies of the type.
But, there is some pilot required techniques for treating them properly, that , if not adhered to can cause some expensive work. A really thorough checkout from someone who is familiar with the type is important. And by familiar I mean not just someone who has flown them. Lots of ex 337 pilots who beat the machines up.

And many of those beat up machines appear on the market at seemingly great prices.

[Colonel]

You can do just about anything to a Lycoming - except let it sit.

However, a Continental will not accept a ham-fisted pilot. They
become one hundred hour engines.

There must be something wrong with me, because I love TCM
engines. When I fly them, they last decades and decades, long
past TBO. Why is that? This is a reasonable question, because
I seriously lack virtue to signal - so why do my engines last so long?

Doesn't make any sense, does it? Virtue is the most important
characteristic of a person, isn't it?

Pop Quiz: It's winter. Cold. After takeoff, what do you do with the
throttle of a fuel-injected TCM - and why?

No virtue is required to answer that question, btw.