Generally, an oil change should be performed every six months or every 5,000 to 10,000 miles driven to keep the engine operating well. You should check your oil to make sure it isn't getting low. Beyond that, you should notice if your oil is getting thick and gritty. Oil starts out a light brown and ends up a dark black. Makes sure to refer to your owners manual for best recommendations. In fact, this is a good reason to seek a full-service oil change facility like Camelback Subaru. Your mechanic can detect and repair an oil leak or other engine problem.