Good point, but I should point out that my old radiator was shockingly clean inside and in excellent condition. Pretty much zero scale visible thru filler and both necks top/bottom. And the Antifreeze was fresh and clean...less than 1 year and less than 1000 miles since I last had the motor out. Obviously I can't see all the way inside each tube...so a new or boiled rad may have done better, but I honestly doubt it.