Highlights

Low mileage of 54,000 miles
One of only six RHD K8 built
Genuine Brabus-built 530bhp 5.4L car
Well maintained with last service in October 2025
Over £10,000 of maintenance since 2021
2025 service included over £3,000 of work by Project AMG
ABC pump, driveshafts and other work by Prestige in 2021
Regular ceramic coat treatment to Obsidian Black paintwork
Current MOT to May 2027 with no advisories

The Appeal

At first glance, the £70,000 required to transform a 493bhp SL55 into a 530bhp K8 seems a lot for a relatively small power hike. But that investment buys much more: Brabus’ engine tweaks give the K8 supercar-challenging mid-range pull and a top speed of over 200mph. Then there’s the rarity - just 50 were sold worldwide, of which only six were built in RHD like this Obsidian Black 2003 example.

It has covered only a few miles in its 23 years, most recently with the current keeper since 2023. The history file reinforces what you see in the photos - this is a very well-kept car. The paintwork and plush interior, with its panoramic roof and Brabus fittings, show few signs of age or use. The history file reveals regular attention by main dealers and well-regarded high-end marque specialists like Prestige and Project AMG. Since 2021, over £10,000 has been invested, including a new ABC pump, replacement driveshafts and regular servicing despite very limited use. The last service was in October 2025, when over £3,500 was spent at Prestige on servicing and other work.

With an advisory-free MOT to May 2027, this is a chance to buy one of the rarest and fastest supercars of the modern classic era.

Key Information

Mileage: c.54,000 miles indicated (supported by MOT and service history)
Country of registration: United Kingdom
Technical inspection status: MOT valid until 27th May 2027 with no advisories
Technical specs: Brabus-tuned 530bhp 5,439cc V8, 5spd automatic, ABC suspension
Paperwork: 1 key, branded folder, handbooks, wallet, V5C, service book, invoices

Service history:

10/25 - 51,973 miles - Project AMG
05/23 - 50,405 miles - Calcot Cars
08/20 - 48,795 miles - Southern Cross (Mercedes specialist)
07/18 - 47,743 miles - Southern Cross
10/16 - 42,320 miles - Southern Cross
01/14 - 37,451 miles - D Newton (Mercedes specialist)
04/11 - 25,253 miles - Steve Redfearn (Mercedes specialist)
11/09 - 20,010 miles - Steve Redfearn
07/08 - 11,965 miles - Mercedes-Benz Waterhouse
05/07 - 8,943 miles - Mercedes-Benz Medway

Notable recent maintenance:

10/25 - £3,593 - Project AMG - servicing and other work
06/23 - £1365 - Alloy Wheel Direct - Brabus alloy wheel and centre cap
2021 - £6,340 - Prestige Car Services - ABC pump, driveshafts etc

The Detail

Very rare K8 in Obsidian Black with factory exclusive black leather interior
Features Brabus ‘Monobloc’ alloys and Brabus badging
Paintwork presents well with some light stone chips to note
Paintwork treated to ceramic coat treatment in 2019 and 2021
Bodywork in good order including arches and sills as shown
20in Brabus alloys in good order with some light tarnish to note
Fitted with matching Continental tyres dated 2026
Underside as shown with no structural advisories on MOT
Vario folding hard top with optional ‘panoramic’ glass roof
Exclusive black leather interior with AMG-branded seats
Seats show slight wear to driver’s bolster but otherwise very well kept
Interior in good order with Brabus touches such as carbon trim
Fitted with Brabus mats to cabin and boot areas
Alcantara headlining in grey
Well maintained with recent work to ABC pump and driveshafts
No advisories on MOT

BEFORE YOU BUY

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