The data indicates that all Mercedes-Benz S Class (2013-17) S350L models with the specified trim and features are equipped with a 3.0-liter V6 diesel engine. Additionally, the primary fuel used by all vehicles in this sample is diesel, reflecting a consistent fuel type across the dataset. This uniformity highlights the model's reliance on diesel powertrains during that period, likely due to efficiency and performance considerations for luxury saloons.