Four to five liters of oil is needed for the 2.3 Turbo (K23A1) engine.
You can pour in one of these oils:
Petro-Canada Supreme Synthetic 5W-30
Idemitsu 5W30 SN/GF-5
Rowe HIGHTECH SYNT RS D1 5W-30
Oil filter – MAHLE OC 617
General Motor Club 🔧 Repair Guides 🔧 Acura 🔧 RDX (TB1/2) 2006–2012 🔧 How much can you put in your Acura’s engine and transmission? RDX 2.3 turbo, 2008