I've been looking at a used V70R (splash pan post) and also noticed some type of black over-spray on three of the four wheels. The dealer said it was cosmoline. It looked like undercoating to me. Is this typical for a car with thirteen thousand miles? Would the wheels have or still have cosmoline on them? Apparently the wheels were serviced at the nimrod service center. It had some clip on wheel weights which didn't fit the rim profile and they managed to install some adhesive backed weights that were kind of machined by the beautiful brembo calipers.