A platform to support verification of the contents of an input-output device. The system includes: a solenoid response module that determines an actual response time based on a position signal; an expected response module that determines an expected response time based on a system voltage and engine oil temperature; and a diagnostic module that diagnoses viscosity of the engine oil based on the actual response time and the expected response time. The method includes heating a corn stillage oil to a temperature of at least 90\xb0 C.