I have an 05 5sp gt and just changed to castrol edge titanium 5w30 runs better than what was in it, definitely a power increase. the manual calls for synthetic 5w30 on the turbo model, pick a brand you trust and change every 3-3.5k miles an you'll be fine.
A 2002 Subaru Legacy uses standard 10w-30 weight motor oil. During the winter, a lighter weight oil may be desirable in particularly harsh locations.
The 2011 Subaru Legacy runs on regular unleaded.
The 2006 Subaru Legacy runs on regular unleaded.
The 2010 Subaru Legacy runs on regular unleaded.
The 2014 Subaru Legacy runs on regular unleaded.
The 2007 Subaru Legacy runs on regular unleaded.
The 2013 Subaru Legacy runs on regular unleaded.
The 2005 Subaru Legacy runs on regular unleaded.
The 2002 Subaru Legacy runs on regular unleaded.
The 2012 Subaru Legacy runs on regular unleaded.
The 2004 Subaru Legacy runs on regular unleaded.
The 2009 Subaru Legacy runs on regular unleaded.