If you're looking to buy a brand new G-Class, you'll currently find that there are only two examples you can choose from – the G500 or the more racy G63 AMG version. The former model was introduced in January with the launch of the latest G-Wagen at the Detroit motor show while the latter received its world premiere a couple of months later in Geneva.

If you're looking for more low-end torque and better mileage, then you will only have to wait a little while longer – the diesel-powered G-Class is set to be made available for ordering by the end of the year.

More G-Class:

The latest rumours from Stuttgart suggest that the G350d 4Matic model will go on sale in December, with production slated to kick off the same month. Customer deliveries are not due to commence until March 2019 at the earliest. Dealers are set to get the first diesel Gs for potential buyers to test during the spring of next year.

The engine that Mercedes is squeezing into the G-Class's engine bay is the same OM 656 motor that was originally introduced last year with the S-Class facelift and later on launched in other models, including the new CLS. In the S350d saloon, it pumps out 286bhp and 443lb ft of torque while in the S400d it's tuned to offer a bit more power with 340bhp and 516lb ft available. Given the G350d name set to be used by Mercedes for its boxy SUV, it’s safe to assume the engine will be offered in the lesser specification.

News about the future availability of a diesel engine comes only a few days after the start of G-Class production at the Magna Steyr factory in Graz, Austria where the iconic off-roader has been in production since 1979. Since then, more than 300,000 examples of the off-roader have been assembled.

Gallery: 2018 Mercedes-Benz G-Class