any oil ever on the exterior of the motor is expected, but not "normal". check around the valve cover for the gasket leaking. the oil pressure sensor (located on the top driver's side of the valve cover) is also prone to leaking i believe. and also the distributor o-ring is a common leak spot. when you test drive the car, check for wobbling of the steering wheel in turns as it could need new tie rods and ball joints with that many miles if the owner has not changed them already. if the car has been well maintained, you shouldn't have too much to worry about... just normal wear and tear really. i reccomend that if you get the car, that you learn to do a lot of the maintenance yourself, because a lot of places will try to screw you for working on these things. good luck with gettin the car
lol i just viewed the engine pics... it actually does look like an oil spill. but still always good to check for leaks