Having just bought some yesterday I can add that the current "synthetic" labelling of DOT 4 seems to be a marketing ploy. Its always been a glycol based synthetic and current labelling does not signify a sudden change.

Richard

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