Will this radiator fit both my automatic and manual transmission Mazda 6?

Yes. This radiator is engineered for both transmission types across the 2014–2018 generation. The cooling system design is shared between auto and manual models — no adaptation needed.

Do I need to flush the cooling system before installing this radiator?

Flushing your system before install is a best practice to remove old coolant and debris that can clog a fresh radiator. Refer to your vehicle service manual for the recommended coolant type and capacity.

What mounting hardware is needed to install this radiator?

This radiator uses factory mounting points and existing bolts. Verify your current radiator mounting hardware is in good condition before install — corroded bolts should be replaced with new hardware from a hardware supplier or your local dealer.