coolant

I've had a bottle of EK-Ekoolant Blood RED for a few years, I bought it on 2014 to change the liquid from a Corsair H-series AIO, I only used a little and then closed the bottle and it has been stored since then. It has a date on top: 02-2013, and it also says: 2 years shelf lifetime. Does it...

Is there an optimal path through components for a liquid cooling setup with 2 GPUs, a CPU, and a 480mm radiator? I was planning on having coolant flow like this: reservoir -> pump -> GPUs -> CPU -> radiator -> reservoir