Supposedly Castrol was (is) the fluid manufacturer and Castrol Transmax Import Multi-Vehicle ATF = Nissan Matic-J. Coincidentally, Castrol had a "Transmax J" fluid right around the same time that Matic-J became Nissan's spec and a number of years later, Castrol released Transmax Full Synthetic and soon after, Nissan spec'd Matic-S (this was around when JATCO started making the 7-speed transmission).I use Idemitsu Matic S - they are the current manufacturer of Nissan Matic S you can buy at the dealer. Its a little cheaper direct from Idemitsu, but still not cheap.