I have a 2009 Matrix XRS (engine 2.4L L-4 DOHC 16v) that I have owned for 3 years. The mileage is about 122,000. It is going through a quart of oil every 1000 miles or so. I have had it checked and I was told that it is a common problem with this engine. One shop advised me to keep an eye on it and add more oil as needed, that it would be very expensive to fix. Another shop told me the same, but said they have products (they are a BG product distributor) that can help. I'm not sure if I should use these products (an engine oil supplement, etc) at my next oil change. Does anyone know if these help with this issue? That same shop also recommended a "fuel system cleaning" to reduce carbon buildup. Are there things to do to help with this known issue besides having an expensive engine repair done?