My radiator is leaking badly and I am going to have to change it. The Acura dealer wants $400.00 for a reconditioned aluminum rad with a plastic top. That is OEM. New, they want $800.00. My question is when a rad goes do you guys/gals replace it with aluminum or do you put in a copper/brass rad. By that I mean the core is copper/brass versus aluminum and the top is plastic. Factory is aluminum and I am wondering what the difference is and should I replace my existing rad with an after market copper/brass. They are much cheaper but me thinks there must be some reason that Acura put an aluminum rad into our Legends as stock. I am wondering what the advantages/disadvantages besides cost are for the two types. Any info/suggestions would be appreciated.