How much oil does your 2011 Forester burn?

Keep records. DO NOT change viscosities. The new chain engine design has very tight tolerances and switching oil thicknesses may hurt you in the long run. The current industry standard is 1 quart every 1200 - what that means is that you cannot sue in court as long as that amount of oil consumption does not exceeded that amount. Higher gas mileage does come at a price. You have to go by what is legal rather than what ought to / ought not to be. You have a powertrain warranty that will cover your engine in case of failure. Subaru takes care of it's customers. If the oil is within the hash marks between oil changes, there is not much you can do. The dealer can perform an oil consumption test. That is the only (legal) way to properly measure how much oil your vehicle is burning. If it is determined that your engine has an oil consumption problem. Subaru will replace the engine. It is as simple as that.