A closer look at used Audi A5 engines: Pros and cons of buying a second-hand engine. Opting for a used Audi A5 engine can be a cost-effective solution, particularly for those on a budget. The significantly lower price tag compared to new or reconditioned engines makes it an attractive option. Additionally, with proper inspection, a used engine in good condition can deliver reliable performance for years. Many reputable suppliers thoroughly test these engines before offering them, ensuring they meet basic performance standards.