Driving the legends of the secret Mercedes archive

It performs keenly on track and revs more enthusiastically and sounds rortier than its standard sister, but there’s noticeable lean during hard cornering, with the effect exacerbated by poor seat bolstering. I’m also privately pleased to discover that the notoriously grumpy dog-leg shift of the Getrag gearbox in Classic’s minter feels notchier and less accurate than it does in my 160,000-mile car.

The CLK DTM is even rarer-groove, as one of just 100 cars made in 2004 and combining a 580bhp version of AMG’s supercharged V8 with a full DTM makeover. It sounds great and pulls more g-force than the 235bhp 190E, although the combination of a torque-converter automatic ’box and vast motorsport shift paddles is a strange one.

Wendlinger is setting a cautious pace ahead in a fully liveried GT Formula 1 safety car – which is surprising until I experience some lurid power oversteer as the CLK’s old-fashioned stability control proves the slowness of its reactions.

On back-to-back drives in the SLS Black Series and GT R, I’m following another GT driven by Schneider. He’s a man who definitely doesn’t do slow. It’s a fascinating experience of evolution; the GT R is grippier and both achieves and holds onto speed much more easily, but the SLS sounds better, turns more keenly and delivers a much more organic-feeling driving experience.

Next up is the earliest stuff, including the chance to experience a near-exact replica of the original 1886 Benz Patent-Motorwagen and a gentle drive in a 1937 320 Combination Coupé whose limited braking powers make 78bhp feel more than adequate. There’s also a terrifying ride in a 40bhp Simplex from 1903, driven by a man who seems determined to set a record around a course of some of Immendingen’s tighter access roads. Meeting a heavily disguised AMG One prototype as we speed along serves as a reminder of for how long Mercedes has been making fast cars.

The next group is the least demanding, a ‘country road’ group drive along some of the proving ground’s 42 miles of replicated real-world routes. The pace is gentle and even an old Mercedes geek like me can raise only modest excitement for a standard W123 230E with a slushy three-speed automatic gearbox and manual windows. A 560 SEC feels more special, if no more thrilling, its V8 combining effortless progress with a big-cube burble.

I notice Japanese warning labels on the coupé, leading me to discover that Classic often buys representative used cars for use in driving events, rather than risk the mint-condition examples it saves from production. The last-built example of each model is automatically sent to the collection, and it will always be fitted with the most popular engine option and painted in the most-ordered colour.

The highlight of this laid-back group is definitely a 1957 300 SL Roadster, a car that feels truly special even when driven at a gentle pace. Its fuel-injected engine was cutting-edge at the time (chosen for reliability rather than just performance), and it responds keenly to the gentlest accelerator pressure. Ergonomics and control weightings feel better than those of many alternatives launched 10 or even 20 years later. Good Roadsters now cost well inside seven figures, so I have some saving up to do if I want to drive one again.

The timetabling fairies have saved the best until last for me: an all-star group to be driven exclusively on Immendingen’s 2.5-mile oval. This track has been built for autonomous vehicle development, rather than high-speed work, but it’s still the quickest part of the facility. Of the four cars, the 300 SL Gullwing was the highlight of the day, run close by the C111. Mercedes made 16 of these mid-engined ‘research vehicle’ test beds, most of which ran Wankel engines, but this one has a 200bhp 3.5-litre V8. It also has a sideways-mounted radio in its centre console, like the De Tomaso Pantera. The combination of 1970s Mercedes instrumentation and a huge steering wheel with a mid-engined driving experience is a strange one, and although it didn’t seem to be going that fast on the wide track, I get back to the staging area to learn the kmh speedometer actually reads in mph. By comparison, the AMG 300E Hammer, a 385bhp V8 version of the W124 E-Class, delivers impressive-for-today velocities without breaking a sweat.

My final car of the day is the dictator’s favourite: the 600 Pullman limousine. This example formerly belonged to the German government and still has bits of what was once high-tech communication equipment on board. The driving position is remarkably cramped for something so big; there’s a sizeable bulkhead between it and the rear passenger compartment. Performance from the understressed 250bhp 6.3-litre V8 is leisurely and lean angles on the ultra-soft air suspension are acute, but the Pullman feels pretty much unstoppable when running at speed.

Mercedes is rightly proud of its Classic division, which is bigger and much more comprehensive than any other manufacturer’s equivalent. History matters to the company, which diligently adds cars to its collection like a connoisseur laying down fine wines. It’s a long-term investment but one that, on the basis of a day with its highlights, I’m very glad Mercedes has been prepared to make.