Define "very old". With the limited information you gave I would suggest that you repair your current car and drive it throughout med school. Find an apartment within walking distance of school if you can. IMO, buying a new car is out of the question, and buying a car that you can afford (about $4,000?) just buys you a car that will likely also need major repair work sometime during your career and will also depreciate. In the end you have to decide what rarely worrying about your car is worth to you. Buy a new(er) car and you won't have much trouble, but by the time you pay it off your cost per mile will be insanely high. Conversely, continue to drive your old beater, occasionally have it leave you stranded (got friends?), but also have a very low cost per mile. That old beater may need work but it's not likely to depreciate and if you stay on top of the maintenance shouldn't leave you effed too often. You just have to decide what your values are regarding money, nice car, and being occasionally inconvenienced. I can tell you that the cheapest route (besides public transpo) is likely to drive your old car into oblivion. Good luck, man...