My oil is a little dark should i chang it

Yes. the regular maintenance intervals services that your car needs are listed in your Vehicle Maintenance Schedule Manual.You bought the car used,you probably don't know when the oil was last changed,so if it's supposed to be changed at,say every 7500 miles and the last person didn't change it when it was time,you now have 15,500 miles on the same oil/filter. Yes,change the oil and oil filter.....