Pinion seal

Was wondering can anyone help me figure out if the pinion seal needs replace cause I always have to put gear oil in the rear end cause it goes low and there's always fresh oil underneath as well here's a couple pics

http://pixady.com/image/0ays/
http://pixady.com/image/0ayt/

Images
http://pixady.com/image/0ays
http://pixady.com/image/0ayt

Quite likely a pinion seal. The question becomes why it failed. If the pinion is tight (has no excessive play) a new seal may be all that is necessary.

If the pinion is loose (has measurable play) a new seal won't solve the problem. The pinion can become loose from bearing wear, a damaged housing, or from heavy load in the reverse direction (compresses the crush sleeve).

Well it's been like that ever since I bought it 9 years ago and over the years I always ended up checking the gear oil every once I awhile. I'm going to guess there is more going on with it then.