Corolla's are very reliable cars but 280,000 miles is a lot of miles for any gasoline engine. I would think that engine will need to be rebuilt or replaced in a while. I would get a compression test before I went any farther in thinking about that car. You could buy a Corolla with 100,000 less miles on it for less than $1600. I would look at more cars. At 280,000 miles, even with a new engine, the car is old and many other things are getting worn out. The transmission , suspension and all of the little things will be getting ready to be replaced. And a newer car would have ABS.