Outsourced assembly-line manufacturing has become important for major automotive original equipment manufacturers (OEMs) in India because it supports cost reduction, supplier specialization, and global value-chain participation. However, this model also increases exposure to supplier delays, quality variation, weak coordination, ICT risks, financial instability, and external disruptions. Existing studies discuss automotive supply-chain risk and supplier selection, but limited review-based evidence connects outsourced assembly-line risk with Indian supplier capability, OEM dependence, and global benchmarking. This study aims to systematically review major operational risks in outsourced assembly-line manufacturing to Indian suppliers. A PRISMA 2020-based systematic literature review was conducted with bibliometric analysis and thematic synthesis, identifying 246 records. After removing 36 duplicates, 210 records were screened and 105 studies finally included. The synthesis indicates that delay, supplier, and management risks are the most critical risk categories that were reported. ICT risks, financial risks and external disruptions also strongly affect operational continuity. In the bibliometric results, articles comprised 66.0% and conference papers comprised 23.5%. Engineering contributed 22.6%, business management, 18.8%, and computer science, 15.7%. This review concludes that supplier capability, digital maturity, structured risk ranking, and policy support are necessary for resilient outsourced automotive assembly systems. The study is limited by its review-based design; future research should use primary OEM-supplier datasets, multi-tier supplier surveys, and predictive risk models.