Never worked since you bought it? Check thermistor behind the little slotted section on the climate panel, make sure it's intact and not broken/bent. Area of the slotted section should be clean and free of debris (blow out or vacuum if not). See attached for reference- https://www.volvoforums.org.uk...

This is a tough one and will take a few steps to get to the problem. Oil can be coming from three places: 1). From oil fill cap; 2) from valve cover and 3) up from the piston. What does the top of piston #2 look like? Is it full of oil? What does spark plug look like reative to others? You need to c...