Do you have your oil analyzed every time you do an oil change? To what end?
By which I mean that I understand each engine has different wear patterns, and by analyzing it each time you'll see how things are progressing and if anything is abnormal. But what does it do for you in the long run? What preventative maintenance will you be clued into?

I ask because I'll likely be buying a new car later this year, and oil analysis is something I've never considered. At $20 a pop, it isn't extravagant, but at the same time, it significantly increases the cost of an oil change, which will add up over the life of the car.

Oh, and if one buys a used car (I haven't ruled it out), is an oil analysis useful without the supporting engine history?

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2005 SAAB 9-2x Aero
1992 Buick Roadmaster Estate Wagon
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From a former life:
2000 Audi S4
1997 Nissan Pickup
1988 Chevy Spectrum