Question about synthetic oil

Hey guys im back, i havent written in a little while, kind of hectic back home. The Alero has the big 30,000 miles on it and am about to make the switch to Mobil 1 synthetic oil and was wondering if by doing that, i have to put synthetic in it for the rest of the cars life or can i switch it back if im a little low on funds in the future? I plan on making the switch a permanent one to help the car out. I luckily havent had any problems with this car and love it, great highway car. Also did they make a 2005 Alero? I heard they did but i was wondering anyways thanks and its good to be back.

Use syn in it any time and don't worry about switching, no problems with your plan.

the 2004 aleros were the last ones built.

oh all right thanx i wasnt sure if 2004 was the last year or not.