Rule of thumb when buying a car:
ALWAYS take it to your mechanic to have it inspected. It will be $100-200 that you can spend to avoid thousands in possible repairs down the road.
and BTW: The 325 is a great car. OBDI and there are a TON of extensive mods you can do to it, a few more than the 328 and 323. It is a very reliable car and engine.