Diesel engines are designed to deliver strong torque, excellent fuel economy and reliable performance. However, over time, carbon deposits can build up throughout the intake and EGR system, particularly on modern diesel engines such as the Mazda CX-5 Skyactiv-D. At Revhigh Tuning Solutions, we recently completed a comprehensive carbon cleaning service on a Mazda CX-5 Diesel Skyactiv-D, including the intake manifold, EGR system, intake valves and exhaust valves. What Causes Ca