The use of oxidation induction times (OITs) of hydrocarbon fluids in predicting oxidative stability has long been of interest to the thermal science community. This statistical study is based on previous work where parameters such as heating rate, temperature, pressure, and sample size were optimized. Here, two reference oils. A and B, and two procedures were investigated and compared on the basis of OIT variability. Calorimeter pan types were also compared. The pans were all made of aluminum but differed in shape, size, surface topology, and contamination species. The effects of these variables on OIT were investigated, and pan characteristics were studied using scanning electron microscopy and energy dispersive X-ray spectroscopy. This study will provide specific parameters to enhance data quality, a simple production method that is easy to implement and data that are easy to interpret. Finally, a precision and bias statement of the final protocol will be developed through a national ASTM round-robin study.