The ONLY reason OEM's use aluminum and plastic is that it is exponentinally cheaper than brass/copper! My 2001 2500 Cummins split one side of the plastic tanks while on a transport a couple years ago, NEVER had that happen to a brass radiator. Sure the solder has split on the top tank but it was simple to fix in a matter of minutes while on the road while the aluminum POS had to be replaced by me in a gas station parking lot after taking an Uber to and from a parts store that had one in stock and I barely got it together and on the road before dark. I have never had an issue with a brass radiator but sure have with aluminum, so this old fart will always err to the side of decades of service...