I recently bought a used CRD and want to change all the fluids. The owner's manual says I need to add an additive for limited slip. I How do I know if mine is Limited Slip or not?

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2006 Sport, GDE FT Eco Tune, Custom Trans Tune
2015 Ram 1500 Big Horn EcoDiesel, GDE Hot Tune

Since you list a '06 you have a open rear diff so no friction modifier needed.The LSD rear option went bye-bye in '06 due to ESP and traction control.

Thank you for the information.

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2006 Sport, GDE FT Eco Tune, Custom Trans Tune
2015 Ram 1500 Big Horn EcoDiesel, GDE Hot Tune