The data indicates that the majority (98.6%) of the Mercedes-Benz SLK (2004-08) 350 Roadster 3.5 272 models are equipped with a 3.5-liter engine capacity, specifically 3498cc. Additionally, all vehicles in the sample run on petrol fuel. Notably, there are very small percentages (0.7%) with slightly lower engine capacities of 3490cc and 3200cc, suggesting minimal variation within the model range. Overall, the engine capacity is predominantly centered around 3.5 liters, and petrol remains the exclusive fuel type for this vehicle type.