See also:

General information
Danger of burns from hot engine Do not open the cooling system while the engine is hot; otherwise, escaping coolant may cause burns. Suitable additives Only use suitable additives; otherwise, ...

Fuel specifications
Gasoline engine: required fuel Do not use fuels that are labeled at the fuel pump as containing metals. Only refuel with lead-free gasoline without metal additives Do not refuel with leaded ...

Tachometer
Always avoid engine speeds in the red warning field. In this range, the fuel supply is interrupted to protect the engine. ...