[subiesailor]

Your car doesn't *require synthetic* so dino oil is fine.

If your really worried do what I did and get an oil analysis.
http://www.subaruoutback.org/forums/89-oil-fuel-discussion/45346-2-5-12-oil-analysis.html

^ what he said. The 2013's got the new ground up engines.

The 11 has the engine related to the family of 2.5's running back to 2003. I run 10-30w in my 2010. Fully within the subaru specs listed in the owners manual. I run 10-30W because thats what I ran in our prior 2.5 which had a long hard life of hauling us and trailers all over the west coast. ZERO oil or engine issues in 180K.

summer time I run synthetic for the California HEAT and long road trips we take. Winter time I often run standard 10-30W given our temps are mild and the car doesn't do much beyond semi rural trips. The Synthetic makes a big difference in keeping heat down and things cool during the hot summers and long road trips.