Subaru dealerships use only synthetic oil which is good for 5K miles or more. I'm a do it yourself oil changer guy on all my cars and motorcycles. The local dealership charges $60 with tax for the change, provides a comfortable waiting room with TV, WiFi, sodas, coffee, and light snacks. I know time is money, but when I compare the cost and time of doing myself compare to them doing it I stop doing my WRX oil changes. Which has me changing the oil before 5K miles and stop having to check my oil as often. Now I check it once month or 1K miles and no problems these first 6K miles.