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The Patrols have grease lubricated wheel bearings front and rear. The is a seal in the ends of the axle tubes to keep the diff oil in the diffs and not in the wheel bearings, if there is oil in the wheel bearings (usually indicated by oil leaking down the brake backing plates) then the seal needs to be replaced.
Check this thread for more info; http://www.nissanpatrol.com.au/forum...wheel+bearings