Service & repair of Audi, BMW, Mercedes Benz, Porsche, & VW - Rennology is Chicago's destination of choice for European Vehicle owners seeking true expert levels of service, repair, and performance tuning. Rennology Motor Sport is the number one trusted, safe and reliable alternate choice to the dealer. We combine honest, straightforward advice with technically advanced diagnostic and service skills. And yes, we perform work covered by your Extended Warranty.