I see m3alabama's point. So you're oil will stay cooler longer which allows you to get the coolant, trans and p/s even hotter. I do agree that these cars need more cooling but that's not the point of the discussion. Its about oil cooling, not cooling as a whole.
On that...I believe TMS sells an all aluminum radiator with an integrated p/s cooler. Now, who's going to come out with an improved DCT cooler? I've been considering adding water/iso alcohol as a charge cooler as well. It helps tremendously on my E46.
Why not water/meth? Because you can get iso alcohol at Walgreens. Need to search for meth.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red