<prompt> Human: By running to the ground, basically repairing it to a reasonable point maybe replace the rear end but not the transmission type situation before getting a new car.I am assuming you would be saving an equal amount in both situations for a car replacement later in life BUT in the later situation you would be using that money for repairs as well. Would it equal out do you think in either decision? Would it be better to sell while your car holds value or just run your car till it stops running and save longer?I am not planning to sell my car anytime soon, just out of curiosity what your opinions would be on this!  <response>: Amortizing the cost of the car over the longest period is cheapest. I bought a new car in 2006. Total cost was 18k. Its depreciated value is 3k meaning my present cost is 15k over 9 years. It is in great shape, low miles and I expect 9 more years for only gas, oil, and minor maintenance.Or I could trade it off and go 15k in debt again for a similar new car, and drop 25 depreciation value by driving it off the lot.First three comments agree. 