About J.D. Power ASI

“The U.S. Aftermarket Service Index (ASI) Study is now in its seventh year. ASI measures customer satisfaction with aftermarket service facilities, providing a numerical index ranking of the highest-performing facilities in the U.S. aftermarket. Performance in three segments – full-service maintenance and repair; quick oil change; and tire replacement – is based on the combined scores for seven factors that comprise the vehicle owner service experience. These factors are (in alphabetical order): ease of scheduling/getting vehicle in for service; fairness of charges; service advisor courtesy; service advisor performance; service facility; time to complete service; and quality of work. “Franchise dealers and aftermarket service providers can use ASI to identify where to close gaps to capture more service customers and increase their revenue share in a growing market of aging vehicles and higher service spending,” J.D. Power said.

The 2026 study is based on responses from 10,572 vehicle owners. Survey data collection was conducted online from January through March 2026. Survey respondents were initially selected from online consumer panels. Respondents who indicated in the JD Power 2026 U.S. Customer Service Index (CSI) StudySM that they had taken their vehicle to an aftermarket provider were asked ASI questions within that survey experience. The data they provided is included in this year’s ASI study.