The 2021 Mercedes-Benz C300d is a Sedan. Expert analysis gives it a score of 8.0/10. Pros: A luxurious feel and an impressive presence on the road; Driver-assistance technologies that ease urban driving; Fuel-efficient diesel engine with high output (239 hp) and a large trunk (490 liters). Common concerns: Higher fuel consumption in traffic jams and heavy heat; Long waiting times at authorized dealerships for routine servicing; High purchase and maintenance costs relative to competitors such as the BMW 320d or Audi A4. Car owners locally report that the C300d provides smooth driving and a comfortable ride even on crowded, hot urban roads, but the main complaints center on high fuel consumption in stop-and-go traffic and long waits at authorized dealerships for routine maintenance.