I have to replace the rad in my baby. Is there an advantage in replacing the Rad with an OEM i.e. an aluminium core rad with a plastic top versus a copper/brass rad. It would appear that an aluminum rad is only available from my dealer. No shops in the area carry an aluminum core rad. Is aluminum better? I know it is lighter and cools faster. What are the advantages/disadvantages. What are you guys using for a replacement rad. Are you sticking with aluminum or putting in copper/brass? Any assistance would be appreciated.