What does Service E mean on a 2006 Mercedes Benz CLS 500?

The Service Code letters indicate the number of hours the service is estimated to take. This is described in the Maintenance Section of your "Owners Manual". The Service Codes do not indicate which Maintenance Services are required. The Service Codes are as follows: Service A: 1 Hour Service B: 2 Hours Service C: 3 Hours Service D: 4 Hours Service E: 5 Hours Service F: 6 Hours Service G: 7 Hours Service H: 8 Hours A "+" next to a Service Code (i.e. D+) indicates need for brake service (inspection)