An upgrade was needed, so I got the F10 530d intercooler installed : r/e39
INTERCOOLER KIT SILICONE HOSE PIPE TURBO FIT FOR BMW 135 135i 335 335i E90 E92 2006-2010 N54 BLACK _ - AliExpress Mobile
Competition Intercooler for BMW 525D 530d 535D E60 E61 04-10 635D E63 E64 06-10 - China BMW Intercooler, Intercooler BMW 525D 530d 535D | Made-in-China.com
Bmw E39 5 Series 525d 530d Cooler Pack Intercooler A/C Power Steering cooler | eBay
Intercooler Bmw E39 - Peças e Acessórios - OLX Portugal