There's a redirect in place that doesn't allow that URL to work. Go through here:
http://www.google.com/url?sa=t&rct=j&q=2012%20owner%27s%20guide%20boss%20302%20supplement&source=web&cd=2&ved=0CDoQFjAB&url=http%3A%2F%2Fwww.motorcraftservice.com%2F%3Flink%3D002%26urlfile%3D%2Fpubs%2Fcontent%2F~WOCMUS%2F~MUS~LEN%2F42%2F12musbs1e.pdf&ei=SipeT724McTg0QHj0qHZDw&usg=AFQjCNE4RBzsKFSbisycyw-zp6zKs40Wcw&cad=rja
http://www.google.com/url?sa=t&rct=j&q=2012%20owner%27s%20guide%20boss%20302%20supplement&source=web&cd=2&ved=0CDoQFjAB&url=http%3A%2F%2Fwww.motorcraftservice.com%2F%3Flink%3D002%26urlfile%3D%2Fpubs%2Fcontent%2F~WOCMUS%2F~MUS~LEN%2F42%2F12musbs1e.pdf&ei=SipeT724McTg0QHj0qHZDw&usg=AFQjCNE4RBzsKFSbisycyw-zp6zKs40Wcw&cad=rja