Hitachi EX20UR-2 Manual page 316

ENGINE/General information
RECOMMENDED LUBRICATING OIL
LUBRICATING OIL
The following lubricating oil should be used.
ldemitsu "Apolloil Superwide 15W-40" (API service classification: class CD)
LUBRICATING OIL CAPACITY (including filter)
3KC1 Approx. 4.5€
3KR2 Approx. 5.5€
W05-01-18