The 서일석유 app is a versatile application offered by GS Caltex 서일석유㈜. It serves two main purposes - providing customer service and facilitating communication among employees.

For employees, the app serves as a communication tool linked with 서일석유's groupware platform. It enables access to CEO messages, company news, webmail, meeting materials, and internal bulletin boards. This ensures effective communication and collaboration among employees across different locations.

서일석유 is a free app available on the Android platform. It offers a convenient and user-friendly experience for both customers and employees, making it an essential tool for those connected with GS Caltex 서일석유㈜.

Please note that if the "Update" button does not appear, users are advised to uninstall and reinstall the app.