I have a 2011 Forester premium with about 50000 miles on it. I love it and wish I'd never had another car. Because of some issues with my being very ill for several months and some idiot at Walmart stripping the screw that lets the oil drain and my difficulties in getting this part (don't live anywhere near dealer but going to have to go there anyway) I am behind on an oil change. The oil level appears fine and there aren't lights. I don't know what 0w20 looks like when healthy so I'm not sure how bad the oil looks. I have no clue if this is related but when I drive slowly, say 10-25 mph there is an engine rattle, especially if accelerating. There is nothing at rest or at normal speeds. I know foresters can be rattley but this sounds like it is actually in the engine, not just a vibration. Any ideas? I'm scared of cost since I am incomeless at the moment.