The 2015 Mustang’s coolant reservoir expansion tank (or reservoir tank) has been the object of a lot of strong opinions among enthusiasts ever since the engine bay was revealed, but beyond aesthetics how well designed is the OEM expansion tank?
Mishimoto gives us an in-depth look at the stock tank’s design — the tank ports, cap, tank split and its chambers. The company then set up a quick testing rig to evaluate the performance of the tank during simulated driving conditions as well as help in its R&D of its own coolant expansion tank design.
Have a look at their test results in the FORUMS.