If it was serviced the dealership (Volvo?) should have drained all the oil out, fitted a new filter and refilled with new oil. Just topping up is not a service. What does the paperwork say they did and has the service book been stamped?
Usually, buying from a dealership you get a multi point check list, ticked with what they have done, even if the car wasn't due a service. Just check it daily till you are confident it's ok.
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If all else fails, read the instruction book.
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