Ducati Diavel Carbon Owner's Manual page 230

Viscosity
SAE 15W-50
The other viscosity degrees indicated in the table can
be used if the local average temperature is within the
limits specified for that oil viscosity.
228
10W
20W
20
30
20W–40 20W–50
15W–40 15W–50
10W–40
10W–30
–10 0 10
40
20 30 40 C
Fig 174