Ducati MONSTER 620 2002 Manuel D'utilisation page 127

Checking engine oil level (fig. 52)
Engine oil level can be checked through the sight glass
(1) provided on the clutch cover.
When checking oil level, the motorcycle should be
upright and the engine warm. Allow a few minutes for oil
to settle to a steady level after stopping the engine.
Oil level should be between the marks near the sight
glass.
Top up oil level with SHELL Advance Ultra 4, if low.
Undo the filler plug (2) and top up to correct level. Refit
the plug.
Important
Engine oil and oil filters must be changed by a
Ducati Dealer or Authorized Workshop at regular
intervals, as specified in the routine maintenance chart
(see Warranty Card).
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.
1
10W
20W
20
30
20W–40 20W–50
15W–40 15W–50
10W–40
10W–30
–10 0 10
2
fig. 52
40
40 ° C
20 30
55
E