2.5 are solid engines, just serviced one with 228 on thursday. Vacuum pump is a typical leak, but if you know what you're doing you can remove the transmission linkage and sneak the gasket in or out, otherwise most places pull the trans. Some also had timing chain issues if people were lazy with the oil change. These are relatively cheap and reliable cars, wouldn't be bad to find a clean one with low miles and have it checked out before purchasing.