mitsubishi mt 160d what kind of oil?

i recently picked up a mitsubishi mt 160d with a 3 cyl diesel it's a great tractor but it's needing an oil change, the manual says 10w 30 but it doesn't specify if i need 10w 30 diesel oil (like for diesel use) or regular gasoline 10w 30, don't want to put the wrong thing in, does anyone know which to use? thank you!