Hennen's Shell Auto Service, we are a family, locally–owned business. We have served three generations of customers and look forward to serving you and your family for years to come. Our skilled technicians have over 60 years of combined experience to handle all of your service needs. Hennen's Shell Auto Service, we are a family, locally–owned business. We have served three generations of customers and look forward to serving you and your family for years to come. Our skilled technicians have over 60 years of combined experience to handle all of your service needs.