Went to a used car dealer selling a 1999 boxster problems it has: radiator reservoir is cracked and leaking, oil appears needs to be changed and needs new battery...going again to test drive it once a new battery is placed in it, dealer says he is going to replace the leaking reservoir?? ANYONE have any suggestions or advice on the reservoir leak problem? Should I be aware of any other problems related to this leak problem before I buy it?? Also how can I check for oil leaks, (by looking under car only??) Also wat problems with the convertible top should I be aware of? dealer put the top down and I was wondering is the hard plastic pretty strong enough to handle being down for periods of time?? ANY other things I should focus on when I go look and drive the car in a week?? (new to porsche boxster) YOUR HELP IS APPRECIATED...