Opel Speedster Operation, Safety, Maintenance Manual page 76

Windscreen wash system
Fill only with clean water to prevent the
nozzles from clogging. To improve cleaning
efficiency, add a little Opel Windscreen Wash
Solvent.
To prevent the windscreen wash system
freezing in winter:
Freeze
Mixture - Opel
Windscreen Wash
Solvent : Water
protection
down to
When closing the container, press the lid
firmly over the beaded edge.
Battery
The battery is maintenance-free.
Ignition system
7016 SN
Protection of electronic components
In order to avoid the breakdown
components within the electrical system,
never disconnect the battery with the engine
running. Never start the engine while the
battery is disconnected (e.g. when using jump
leads).
The battery must be disconnected from the
vehicle before being charged: first disconnect
the negative cable and then the positive
cable. The polarity of the battery, i.e. the
connections for the positive and negative
cables, must not be interchanged. When
reconnecting, first connect the positive cable
and then the negative cable.
of electronic