Coolants cannot be mixed.
Volvo Penta 5 litre Yellow Coolant Ready Mixed and ready to pour. Yellow coolant is for newer Volvo Penta engines and different colours of coolant cannot be mixed so please ensure you order the correct colour. Leisure craft engines are often subject to greater wear than other engines. Leisure craft are frequently run intensively for short periods and then laid up for long periods. It is therefore especially important to chose the coolant for marine applications.