I asked the same question on another website forum a while back.
Someone mentioned that this should be a decent routine for your most used and high mileage cars:
The first 150 (or 300) miles + every 200 or so miles each time = Oil Change
15,000+ km = Engine Rebuild
30,000+ km = Chassis Refresh
The numbers aren't concrete, and there are some unseen variables yet to be factored in, but that's generally what should be done (or at least what some go by). Your car's chassis will be fine after a good long while, and should be the least of your worries. The only thing you should worry about is your HP drops, but even so, your engine can take a pretty decent beating too. It's just the scheduled oil changes that you have to keep up with. Also take note that after a certain amount of mileage is put on your car (a massive amount of miles, I might add), you permamently lose HP. No matter how many oil changes and engine rebuilds you do, your car can and will lose HP forever. But that's not for a long while.
Hope this helps, as this is what I've been able to find out about it.