When should you get a transmission flush?

Drain, change filter and refill .. Don't flush!

2011 Nissan-Datsun Maxima V6-3.5L (VQ35DE) Vehicle » Maintenance » Fluids » Fluid - CVT » Technical Service Bulletins » CVT - Fluid Applications CVT - FLUID APPLICATIONS Classification: AT12-006 Reference: NTB12-068 Date: August 20, 2012 NISSAN; CVT FLUID INFORMATION APPLIED VEHICLES: All Nissan Vehicles Equipped with CVT APPLIED TRANSMISSIONS: CVT SERVICE INFORMATION IMPORTANT: When servicing a Nissan vehicle equipped with a Continuously Variable Transmission (CVT) make sure to use the appropriate Nissan CVT Fluid specified in the Electronic Service Manual (ESM), Owners Manual or Service and Maintenance Guide. Using fluid other than that specified may damage the CVT and is not covered by warranty. ^ NISSAN CVT Fluid NS-2 ("green fluid") - applies to all Nissan vehicles equipped with CVT except MY13 Altima. Use NS-2 green fluid to service these vehicles. ^ New, unused service replacement CVTs may have some residual "blue" NS-3 fluid. However, these service replacement CVTs should be filled with NS-2 green fluid. No draining is necessary. ^ NISSAN CVT Fluid NS-3 ("blue fluid") - applies to the 2013 Altima. Use NS-3 blue fluid to service these vehicles. ^ Use of any other type of fluid, including NS-2 green fluid, in the 2013 Altima vehicle may result in reduced fuel economy and/or affect drivability