that's kind of a crap-shoot. Not allowing the car to ever get up to proper operating temperature all this time I'm sure caused the engine some stress. Really, it depends alot on how you drive it. If it stayed cool all the time and you drove her hard, then I would have to say it definitely caused more-than-normal wear. But how did you treat it in the service department? Did it always get synthetic every 5K miles, or did it get WalMart 99 cent oil every 10K miles? Every little thing counts. What does that mean in the long-term? who knows? could be that it will go 220K miles instead of 240K miles. Could be that it would die tomorrow. You just never know. If I took care of the car, I would try not to worry about it, personally.