I have always used a light application of grease and then oil on top of it for a very durable lube and a quieter freehub. Historically I know that some sewing machine oils were vegetable based but I don't know if that is still the case. Chain lubes vary widely in what they are. Brake fluids are sometimes not ideal lubes. Just find something like a 20w or 30w viscosity lube (similar to motor oil). Any hydrocarbon lube with sufficient viscosity will be fine. I would avoid "thin" oils if only because of the resulting noise.