Lubricating and fuel oils can be characterized for their low-temperature specifications with better repeatability and reproducibility than the standard pour point and cloud point methods. These low-temperature tests are non-destructive and can be followed by using the same sample for measuring the high-temperature thermal stability of the oil (DSC destructive test). The oil sample can be as small as 10 mg. The presence of pour point depressant additives separated the wax crystallization DSC effect (exotherm) from the wax melting effect (endotherm), and also produced heat-flow effect in the higher temperature region.