[Tom, F&L GoR]

I suppose the real issue is useful remaining life. If it exceeds your life, then it doesn't matter what the car's history was. As someone with a little lubricant formulation field experience, I can say almost all cars are driven, not towed, to the junkyard. As a DIY mechanic, there are lots of easy things to take care of and keep the car running fine. We are all guessing at what the major "oops" will be and assuming it now happens much sooner rather than later.

I bought a "high mileage" 1994 (20,000 miles!! in 1998) that was drag raced a lot; I have 74,000 miles and can look back and say the only possible related failure (which might have just as well been me) was a recent third gear synchro and a slave cylinder (repaired both at the same time.) Head gaskets are original, OEM half shafts, I changed the clutch because I was in there and it was fine...

So Joe117's question is valid, but in my experience, if there's nothing showing up now, the answer is likely to be beyond the point of where you can strictly assign the problem to running the car harder. And as properly noted, running the car in city stop and go, or even not at all, can cause a whole different set of problems.

It's a car, not an investment. You can only enjoy it if it gets used.