We own a 22 Acura RDX Aspec and got free oil changes for the vehicle. To my surprise the dealer uses Acura synthetic blend motor oil. It has the 2.0 direct injection turbo motor. I know it's probably a cost thing but shouldn't full synthetic be used. We are meticulous with the oil changes, change it every 3 to 4 months anyway, short distance driving. Who refines the Acura synthetic blend oil?