What to do about turbo lag on S80?

To address turbo lag on a Volvo S80, consider checking and potentially replacing the turbocharger's wastegate, as a malfunctioning wastegate can exacerbate lag. Additionally, ensure that the engine's air intake and exhaust systems are clean and free of restrictions, as this can improve responsiveness. Upgrading to a larger turbo or tuning the engine management system can also help reduce lag. Regular maintenance, including oil changes and ensuring proper intercooler function, is essential for optimal turbo performance.