How much grease leakage from the steering knuckle is normal (large ball beside the hub)? Mine 02 G500 has several ounces of dirty grease outside of the ball. 12k miles.

It's normal. They are designed to seep. The grease traveling in that direction prevents dirt and water from going in the other direction.

There is a fill hole on the rear side of the hub. Your service center should keep the grease filled to the bottom edge of the fill hole; i.e. half full or axle shaft level. More than that puts excessive pressure on the CV joint boot and the axle shaft seal.

__________________
1973 280SE 4.5 (Sold)
1984 LWB 280GE (Sold)
2000 G500 NMLE - "Deep Throat"
2007 ML320 CDI (Sold)
2010 Porsche Cayenne S Transsyberia TipTronic (Sold)
2010 Audi Q7 3.0 TDI (Sold and Sorely Missed)
2014 ML350 BTC
2015 Audi Q7 3.0 TDI (On Order)

Thanks, appreciate the advice!
Steve

Is this what you mean? Because I’m wandering if I need same repairs.

Thanks Vasco

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That does not look right. The swivel ball housing is supposed to have multipurpose grease inside. The material that seeps past the swipe seal should look like and be the consistency of grease - not oil, as you have.

Someone either tried to fill the swivel ball housing with gear oil instead of grease or you are leaking gear oil past the axle tube seal.

Checking the oil level in your differential housing will give you an indication. It should come up to the bottom of the fill plug. If it's low, you're leaking past your axle seal.

__________________
1973 280SE 4.5 (Sold)
1984 LWB 280GE (Sold)
2000 G500 NMLE - "Deep Throat"
2007 ML320 CDI (Sold)
2010 Porsche Cayenne S Transsyberia TipTronic (Sold)
2010 Audi Q7 3.0 TDI (Sold and Sorely Missed)
2014 ML350 BTC
2015 Audi Q7 3.0 TDI (On Order)

Thanks for the tip; I’m going to check it.