car mechanic, simulator 2021, game, earning money, repairing cars, servicing, engine work, tire changes, oil changes, brake repairs, car restorations, selling cars, completing jobs, upgrading garage, efficient workflow, time management, customer satisfaction, bonus objectives, in-game economy, strategy, resource management, virtual currency, profit maximization, skill improvement, game progression, realistic graphics, immersive gameplay, detailed car models, interactive garage environment, tool upgrades, parts shopping, auction participation, paint jobs, performance tuning, diagnostic tests, car flipping, financial management, player engagement, gaming challenge, entertainment.