Hi.
I not understand a lot about Mack but in Volvo i-shift, across the years, some different models and his recommended oils i have catched are:
Manufactured Year 2010 Through 2016:
Oil cooler integrated into the radiator (commonly manufactured 2010-2014):
97318
Transmission-mounted oil...
HI.
It is difficult to find a oil for volvo trucks with gearbox i-shift.
The oil recommended for this 2016 truck is (75w90 API GL-4 fully synthetic).
Searching over the web, i can find volvo original oils but only 75w80 API GL-5.
Some oils are compatible but near impossible to find on USA...