thanks friends
the poor seller tried hardly to convince me to buy copper one
but i choosed the alluminium radiator
and now im very happy with it now even with the extrem outside temp 44°C with ac one my car max temp is 90°C
i read an excelent article that helps me alot to now the difference betwen copper and aluminium
Aluminum VS. Copper-Brass Radiator: Final Thoughts
my old radiator was aluminium and the new one also
but i noticed that the old one is heavier and also much stronger than the new one