I was wondering how to decline an English loanword like "Oscar". I know that there are no fixed rules. Sometimes the native declination is adopted, sometimes words are declined according to corresponding German rules.
"The Artist" hat dieses Jahr 5 Oscare gewonnen.
Unter den Gewinnnern der Oscars war Angelina Jolie.
Von den Oscaren hatte Meryl Streep auch einen gewonnen.
These examples all sound odd. What would be the gramatically correct way to decline "Oscar" in German?