Genuine Volvo Penta coolant is available in green and VCS yellow. Volvo Penta coolants are made to exacting standards to protect your engine from corrosion and freezing.
Never mix with VCS yellow coolant with Volvo green coolant. Your Volvo Penta was supplied with either Green or VCS yellow coolant. They must never be mixed nor swapped over. Earlier variants of any Volvo Penta petrol engine, pre-2003 are likely to use the green type. Later Volvo Penta petrol engines may be supplied with VCS yellow coolant and they should be kept on this type.