Off topic a bit
SSG et al. brings up an interesting point, namely bearings. He seems to be aware of a bearing life issue that's outside my limited (45 years) experience.
Bearings and lube systems on our engines have generally been very reliable; I can only recall one bearing on one engine type that required special attention, and it is no longer a worry item after the type achieved maturity.
Who else finds bearing life or reliability a significant worry?