are pretty tough.
I had part of a 3GM30
piston break off at about 4 yr. I pulled the engine and took it to Mack Boring.
While waiting for the engine to be rebuilt, I went off for a short cruise
, probably just a weekend. At speed under sail, that sail drive moved around quite a bit! I don't think I would do that again, but the seals for both engines are still going strong starting the 16th year.