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Vehicle manufactures are significantly increasing the production of Direct Injection Gasoline (DIG) engines to help meet the requirements of governmental regulations and the demands of consumers. While DIG powertrains offer multiple advantages over conventional gasoline engines they can be susceptible to fuel related deposit formation, specifically within the fuel injector nozzle. Fuel injector deposits have been linked to a number of negative effects that can impact the normal operation of the engine. A DIG deposit test has been developed to evaluate Deposit Control Additives (DCA) and their effect on injector deposits. Multiple metrics for evaluating fuel injector deposits were investigated to determine a suitable method for quantifying deposit formation. Interrogation of the vehicle On-Board Diagnostic (OBD) system was identified as the optimal method for quantifying deposit formation throughout the duration of the test.