The GLS 350d is by far the biggest seller in the range, with a 3.0 litre diesel engine with 258 horsepower, giving the big heavy 7 seat car a 0-60 time of around 7.9 seconds and a top speed of 137 miles per hour. Mercedes seems to have dropped the letters CDI from the naming recently and stated using the letter "d" instead - they both just mean "diesel" but the Bluetec is a slightly cleaner engine with improved fuel economy figures in the high 30's miles per gallon and CO2 figures around 199 g/km. Spec levels are understandably lavish, with "!" alloys, keyless entry and start, lane keeping assist, heated folding and dimming door mirrors, parking assit, air suspension, LED headlights, a panoramic sunroof, privacy glass, sports brakes, memory seats, COMAND online sat nav, DAB radio and a Harman Kardon surround sound system. The full range of new Mercedes GLS 350d Diesel deals are shown above, just click on the model you are interested in to see Orangewheels best deals and special offers from our franchised UK main dealerships, to get a low cost PCP finance quote or part exchange valuation against a brand new 2020 GLS 350d for sale.