I always ran mine on Fuchs Ultra MC 15/40,although now I'm using the last of my 20 litre Gulf Western Top Dog 15/40....5,000km oil changes.I now work at a Mitsi dealer and we run them on Fuchs Ultralube 15/40,and do 10,000km oil changes (customers don't want 5,000km oil changes as recommended by Mitsi)