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So O2 has zero of heat of formation (or enthalpy of formation). The enthalpy of a reaction is defined like this: H = Hproducts-H reactants. The enthalpy of reaction in this case, is the same as the heat of combustion. Hproducts is obtained summing the heats of formation.
RE: Temperature of combustion SI engine. If understand the flame temperature diagram correctly, the temperature difference with oil is roughly 2200 C (2200 K) (starting at 298 K). So, if one ends up with a temperature of 600 C at TDC just before ignition, the temperature should reach 2800 C after ignition. RE: Temperature of combustion SI engine. EGT at the exhaust port on my 2.0L - FI - 4cyl @ 28psi MAP is between 1200-1600F. There is going to be a big difference between combustion adn actual gas temp.