Hey i'm new here but i've heard that you guys are the fluid gurus to talk to if i need advice on oil. I have a 2005 G35x with is an AWD car at 42k My FSM states i need to use the following fluids. ATF = Genuine NISSAN Matic J ATF Transfer Case = Genuine NISSAN Matic D ATF (Continental U.S. and Alaska) or Canada NISSAN Automatic Transmission Fluid Front and Rear diff's = API GL-5, Viscosity SAE 80W-90 On the bottom the follow notes were listed... *2: Using automatic transmission fluid other than Genuine NISSAN Matic J ATF will cause deterioration in driveability and automatic transmission durability, and may damage the automatic transmission, which is not covered by the INFINITI new vehicle limited warranty. *3: DEXRONTM III/ MERCONTM or equivalent may also be used. Outside the continental United States and Alaska contact an INFINITI dealer for more information regarding suitable fluids, including recommended brand(s) of DEXRONTM III/ MERCON TM automatic transmission fluid. I bought J-matic since i'm still under powertrain warranty @ $13/qt. I bought 5 and only used 4 for the drain and fill. I bought Mobil1 75w90 for the front/rear diffs I haven't bought D-Matic yet. Its $11/qt Reading the FSM, it somewhat says i dont need to go matic-D any fluid would work. Is this true? I've heard that castrol is the real vendors of nissan fluid. And nissan just resells at higher profit. Like nissan buys at $5 a bottle, sells to dealerships for $7.50 and the dealership sells it to us for $11-13. what do you guys recommend use in terms of fluid. I ran Mobil because it was priced at 11$ a bottle and royal purple was $20. Nissan didn't have any in stock for me.