Check out this thread Topline. The Mannol coolant I linked to and have been using does conform to WSS-M97B44-D as well as very many others.

BTW I can recommend this inexpensive coolant refractometer for measuring the freezing point of your coolant in situ. It can also measure SG of battery electrolyte to give accurate indication of your batterys SOC.

[Linked Image]

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone