I understand it's best to just follow the recommendation. However, the manual for my G37(S) 2009 says "add Genuine NISSAN PSF or equivalent". The cap on the reservoir says "ATF Dexron". So which one should I use? Also I assume if it's ATF then Dexron II and Dexron III are both ok.

On Amazon I also found "Genuine Nissan Fluid 999MP-EPSF00P Electric Power Steering Fluid". Is there a difference between ELECTRIC PSF and just PSF? Or do they both mean the same? It that 999MP-EPSF00P what the manual refers to with Genuine NISSAN PSF?

Dexron VI is the equivalent of Genuine NIssan PSF according to the Factory Service Manual. Looks like Valvoline makes it for an off-the-shelf purchase.

Thanks a lot. After your post I googled the Factory Service Manual and it pointed me back to NicoClub.com . I ended up buying Valvoline DEXRON VI Full Synthetic Automatic Transmission Fluid. Amazon also had Mobile but that one is a blend which is probably ok. I didn't go with the Nissan one (999MP-EPSF00P) because it's Electric(!) Power Steering Fluid and I couldn't find and 1 quart (hydraulic?) PSF.