I agree with Kit, Amarin and Art B. Looks like oil. Out of curiosity, how many miles on your engine? Could very well be valve seals if high miles.
Try doing as KGV suggested, rev the engine to a higher rate of speed, let off the gas and check your rearview mirror for blue smoke. My 90 240 with the b230f never had that issue but at high mileage (230k+) both my 88 Jetta and 95 850 did. Good reason for always using synthetic oil. Didn't in those cars, but I do now...:)
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Will I buy another Volvo??? We'll see....
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