Opel CASCADA Owner's Manual page 231

Capacities
Engine oil
Engine
including Filter [l]
between MIN and MAX [l]
Fuel tank
Petrol/diesel, refill quantity [l]
A14NEL, A16XHT
A14NET
4.0 5.5
1.0 1.0
Technical data 229
A20DTH,
A20DTR
4.5
1.0
56