I think it comes down to simple - basic maintenance... Change your oil regularly and use a high quality filter and oil when you do it. If you over heat your engine changing you oil is mandatory.
I don't know anybody (shop or individual) that actually analyzes their oil, you simply change it when it's due. If you have 100-150K miles on your engine, spring for a new pump and pickup screen while you're at it and you might get another 100K miles out of it.
Premature camshaft failure can be many factors. The biggest cause is poor circulation. Old oil, bad oil, clogged filter or supply/drain galley ways are most probable. The second biggest failure is due to poor metalurgical properties and/or machining of the camshaft. The stock units are general purpose so they are not made from high nickel and chromium alloy metals. I don't believe they are forged either, they're cast.
As much as I hate to say it, a Jeep motor is far from the specifications of a Porsche motor. You can drive a bus through the differences.