oil leak and noise from ac

The noise from the a/c is a continous roaring noise but not to loud and my vehicle has 242,000. Two of the plugs had some oil on them and no they didn't misfire. It drives smooth and ideals good.

Wow, that is quite a few miles for 5-6 years! I would say it is very possible your compressor has wear. The clutch probably has excessive clearance and the bearing in the pulley probably has wear, as the shaft of the compressor likely has. My suggestion would be to keep an eye on it (an ear...) and be increasingly concerned as noise progresses, or changes. As far as the oil...really, I'm not terribly surprised at 242,000 miles! Watch your oil level and make sure you are not losing (consuming) too much, if any. Keep in mind that Ford and Mazda in 2005 said a quart consumed every 900 miles is ok. Now they say a quart every 1,500 miles is ok. You did not mention consumption, but I am making that assumption with oil on the plugs. Again, warning signs of eventual wear out, but who could complain with that mileage! Keep up the good maintenance as you must be doing and I'm certain you will enjoy many more miles regardless.