Ducati 999 Owner's Manual page 180

Viscosity
SAE 10W-40
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.
10W
20W
20
30
20W–40 20W–50
15W–40 15W–50
10W–40
10W–30
–10 0 10
40
40 ° C
20 30
81
E