The 3.0 litre V6 diesel engine in the S350d has been a stalwart in the UK S-Class line up since the year dot it seems. Refined and improved every year it's a fantastic motor and for those doing higher mileages and/or lots of motorway work then it's a perfect car for you. With 286 horsepower in this iteration there's a mound of mid-range torque for simply effortless progress in accelerating or overtaking and as a fast lane express there's no place better to be. 0-60 is just under 6 seconds but it's the way it gets there that's impressive with no drama just seamless pull. Fuel economy is always the main reason for diesel choice and it's no different here with official figures at early 50's mpg, though early-mid 40's is more likely in day to day use. The entire selection of new Mercedes S350d Diesel deals are shown above, just select the new car specification you're after to see our best prices, deals and special offers from our authorised UK main dealers on a new 2021 S350d for sale in the UK, either as a cash deal or with a low rate PCP finance quote.