Air injection into deep, light oil reservoirs is a potential technique for large scale improved oil recovery. The feasibility of an air injection process relies on complete consumption of oxygen from the injected air to achieve a nitrogen flood. In this study, the oxidation kinetics of light crude oils was investigated at typical reservoir temperatures (90-140 degrees C), and high pressures. The oxygen consumption rate was measured from the reduction in the oxygen partial pressure using a small batch reactor (SBR). Measured pressure data for different crude oils was used to establish a simple reaction rate model of acceptable accuracy for reservoir simulation. At the relatively low reservoir temperature of the experiments, the main gaseous product from the reaction was carbon dioxide. Additional experiments were performed in a high pressure oxidation tube (0.1 m diameter and 1.5 m long). The oxidation rate data obtained was used to validate the reaction rate model. The low temperature oxidation (LTO) scheme and its implications for the Air Injection LTO Process are discussed.