I am a newbie to Volvo, I needed a vehicle with some cargo area. Car seems to run fine but after 4 days I see oil leakage around pan on the side of a black casing? I am starting to panic about this purchase!!

 

No need to panic most oil leaks are due to old rubber hoses and or clogged hoses. unfortunately your post tells me nothing to go by and I can't offer a solution. Try to be a little more clear and people will step up to help you. Maybe a photo or two?