Opel Automobile Owner's Manual page 164

164 Vehicle care
When the engine oil level has
dropped to the MIN mark, top up
engine oil.
We recommend the use of the same
grade of engine oil that was used at
last change.
The engine oil level must not exceed
the MAX mark on the dipstick.
Caution
Overfilled engine oil must be
drained or suctioned out.
Capacities 3 239.
Fit the cap on straight and tighten it.
Engine coolant
The coolant provides freeze
protection down to approx. -28 °C.
Caution
Only use approved antifreeze.
Coolant level
Caution
Too low a coolant level can cause
engine damage.
When the cooling system is cold, the
coolant level should be just above the
KALT/COLD mark. Top up if the level
is low.