it calls for an SM rated oil. in the 5/40 for winter weather, my MAX has T6 in it. i change it once a year or around 1500 miles.
i'd think any that are SN/SM rated and good for you climate, you'll be just fine.
08 6.7 cummins G56
04 5.9 cummins
11 ranger 4.0
16 KTM 250 XC