How to do it? My friend would like to know so he can do it himself on his new ML when the time comes.

I just did it this past weekend at 1100 miles. It's a piece of cake.

Vacuum the oil out through the dipstick tube. Replace the filter. Currently, the wrench to remove the filter cover is only available from MBUSA (Hazet will have one available soon.), and is very pricey. See earlier threads for the P/N.

He'll need 9.5 qts of the approved (only two brands) oil. I got the Mobil 1 ESP Formula M 5W-40 from my dealer's parts department.

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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)