Being a service manager in an automobile firm would depend on your experience, whether you choose sales or service section, your qualifications, your leadership skills, qualifications and the pay of the last job.
There are sites like naukri.co, glassdoor, indeed wherein you can register, enter your details and compare the job profiles and salaries. Here this data is based on what actual people in similar roles earn based on their experience.
This website (https://www.payscale.com/research/IN/Job=Service_Manager_Automotive/Salary) states an average salary of around 5 lakhs/year. please check further based on your profile.
There are sites like these (https://www.payscale.com/my/survey/choose), which gives you an estimated salary for the new job you are looking for.
Generally service managers within the showroom, repair floor, service unit of major automobile companies would need a person who is dynamic, flexible, able to manage the floor productively and deliver a high-quality workmanship that results is good levels of customer satisfaction and hence good gross revenue and earnings for Mahindra & Mahindra or Tata Motors.
You would be required to have a grasp of hiring good talented junior staff, supervising the work allocated to them, focus of the benchmark service standards of the company and complete the work within time deadlines.
Having an experience in handling complex situations, working knowledge of the automobiles, managing difficult or aggresive customers, teamwork skills would be a positive in your CV.
Some of the jobs would also be focussed on training junior staff, interacting between marketing teams, smaller dealer showrooms, sales teams, Managing AMCs of the region or valuation of pre-owned vehicles. So, the range is wide.
In today's world, most private sector jobs are stressful and the automobile sector is no exclusion. This sector is highly competitive with many players targetting potential customers.
Instead of thinking it as stressful, assess your strengths and take it as an opportunity to deliver the best and make a name for yourself within the company as a reliable service manager who is dynamic, proactive and has the right balance of ethics and drive to improve.