I thought Saturns could rot from underneath. Well, just like any other car, but with a spot or two extra.
I'd look underneath. Heavy rust, time to junk. Interiors can be cleaned.
But I'd think $2,500 for a motor, plus whatever else is apt to die over the next couple of years, would have me spending $4k or $5k for something else. I guess if he has zero regard then $2,500 is the cheapest option. But I'd move on if it was me.