I change my oil yesterday and found bunch of gease leaking all over side of my oil pan . The milky color . I though it was coolant . Then I saw bunch of drip grease under my front diff . That explains why my 4x4 not working and it show the wrench icon . How hard is this job and any one know how much the shop charges for this job . Also I don’t know how long I been driving like this , wonder it cause any damage . I haven’t checked the level of the fluid properly.