So we've all seen the oil stained wolf out in Borean Tundra, and probably a lot of us tried to tame the wolves as well only to end up with a normal grey looking worg. Well the trick is out, it can be done, here is a guide on how to tame the oil stained wolf so that it keeps it's oil slicked coating!
EDIT: updated this tame as of 4.0.1. Go to 3:40 if you are level 80 with decent haste to see the tame. If you are low leveled (72-78), use the ice trap method.