As for my Ural 2WD sidecar, it was phenomenal and performed extraordinarily !
Out of all the modifications I made in Switzerland with Giorgio, only one was necessare for this ride, 
the 2 Odyssey dried battery that allowed me to stat on my own power every morning this winter - Except one !!!
I used Shell mineral motor Oil 5W30 for the motor, 20W50 for the gear box and normal transmission oil for the rear shaft.