The Oxidative Conversion of Methane (OCoM) reactor, within the C123 process, is a novel concept for methane valorization into a product stream with a molar C2H4/CO/H2 composition of 1/1/1, i.e., suitable for further hydroformylation. This overcomes the limitations traditionally encountered during the Oxidative Coupling of Methane in the pursuit of a maximum ethylene yield. An experimental assessment was performed using a MnNaW/SiO2 catalyst under industrially relevant conditions (T=850°C, ptot=100 kPa, Wcat/FCH4,in = 2–2.5 kgcat s mol-1, CH4/O2 inlet molar ratio = 3 – 5 mol mol-1 and inlet CO2 molar fraction <20%) as a basis for kinetic model development. Simultaneously pursuing a C2H4/CO/H2 molar ratio of 1/1/1 and a maximum C2 yield, the impact of the operating conditions on the OCoM performance was simulated. Three different real feedstocks were assessed: natural gas, shale gas and biogas. Shale gas exhibited the highest OCoM potential, with as optimal operating conditions T=850°C, Wcat/FCH4,in = 6.5 kgcat s mol-1, CH4/O2 inlet molar ratio = 10 mol mol-1. The achieved C2H4/CO/H2 molar ratio amounted to 1/1.1/3.7 with a carbon yield (ethylene + CO) of 28% mol mol-1 and ethylene yield of 19% mol mol-1. Last, the considerations to validate the C123 process viability are given.