Vehicles wear out. They wear out if you drive them, they wear out if they sit to much. Both have disadvantages, thats life. As long as you let it get to operating tempurature and stay there for a bit, you should be doing ok. Keep in mind though that the oil takes about three times as long to heat up as the coolant does, and transmissions and differentials need substantial driving(15-20 miles) to really get warm. Also modern Gasoline has a shelf life of only
6 monthes or so, so either use it or only try to fill it with as little as you need, lest you spend $2 a gallon and have it go funky on you.
MV