September 2013 was the most successful month in the history of Mercedes-Benz in the UK, with every division reporting best-ever results.
Mercedes-Benz Cars registered 21,177 new models last month - up 28% on last September, according to figures released by SMMT.
It is more than the company sold in its first full year of operation at its Milton Keynes headquarters in 1985.
Year to date (YTD) figures are also at record levels, up 18% to 85,956 new cars.
The company's market share for September was 5.3% - another record. September topped a record-breaking quarterly performance for Mercedes-Benz Cars, AMG and Vans - the best three-month results in the company's history
Mid-month, AMG broke through its previous year-end result for the whole of 2012, and 2,506 new AMGs have already taken to Britain's roads this year.
The results ensure that Mercedes-Benz remains the UK market's fastest-growing full-line premium car brand.
Record results were recorded for A-Class, B-Class, as well as full-ranges of C-Class, E-Class and CLS. YTD fleet and business registrations are up 13%, and 27% more private purchasers have chosen Mercedes-Benz so far in 2013.
With 5,766 new vans, the UK division beat every other Mercedes-Benz market in the world to be global number one market in September 2013. The vans team beat its previous best performance by more than 1,400 Citans, Vitos and Sprinters.
In trucks, 1,050 units was the best month ever, and Fuso Canter's 148 new registrations was again the best ever performance, up 80.5%.
Marcus Breitschwerdt, president and CEO Mercedes-Benz UK, said: "In isolation any one of these figures would be a proud moment for us. Combined, they're spectacular - with every division returning best-ever performances.
"When you consider that these results are the latest in our consistent record-breaking results that we at Mercedes-Benz in the UK deliver month after month, it is clear to me that with dedication and momentum, we're set to deliver even more records before the year is out.
"Our results this month are thanks to the extraordinary efforts of our team here at head office, but also every single person in our three dealer networks. Cars, vans and trucks - we've got an incredible team of hard-working professionals committed to doing their best for our new and returning customers."