You don't have a powerful engine. I have a 3.0 Duratec Escape that has more HP. It uses 5/20 Motorcraft. That is a fine oil. Relax and run it out normally. Your engine won't self destruct.
this thread is kind of moot now,to the original poster, from so far back into 2005.
I have been known to custom blend what I was looking for in an oil, and they always seem to run fine and mix as well.