[Tatsfield]

Looking at the history of automatic transmission fluids for Aisin Warner gearboxes, it looks like the first standard encountered on Volvo cars was JWS 3309. As Aisin Warner introduced transmissions with increased numbers of gears they needed to reduce the viscosity of the fluid used and introduced JWS 3324. Both these fluids conformed to their overall transmission fluid spec AW-1 but when they put in the lower viscous oil they started to refer to it by the AW-1 overall spec nomenclature. So in answer to your question, JWS 33324 is an AW-1 spec oil but is for use in cars with more than 5 gears. Older boxes with less gears use JWS 3309 which, while it is an AW-1 oil, is not referred to as such to avoid the possibility of wrongly using the thinner oil in the earlier boxes.