I have a 2011 subaru outback 2.5 premium with 39,779 miles on it. I bought the car with 25,000 miles on it and have had it for a year and a half. I change the oil every 3000 miles, usually a bit early around the 2,500 mile mark. I change it with valvoline synthetic since I have owned it and before i bought it it was serviced with the same stuff. I have had all of my oil after every single oil change I have done with it at my local mechanic come out completely black. I'm not sure what to do since Subaru doesn't have any idea whats going on and my local mechanic is scratching his head as well. Any ideas or thoughts?