I think my old brass radiator is finally ready for the boneyard. Took it into a radiator shop about 3 years ago and the guy "cleaned" it out and soldered the leaks. During pressure testing, every time he bumped up the pressure, it would spring a new leak and he would solder it. He said not to use anything higher than a 10 lb pressure cap. He also said "I wouldn't drive it across the desert." Anyway, car started overheating yesterday, and I'm thinking it is time to retire old leaky. My question...anybody have any experience with Spectra Premium radiators SPI (aluminum and plastic). I also heard that aluminum cools better than copper. I would get a new brass/copper one but they cost 3x more.