1. The evolution of the Mercedes R129 interior

2. A balance of tradition and modernity

3. Inspired by the S-Class

4. Safety and ergonomics: A step ahead

5. Comfort enhancements

6. Revolutionary seating and seatbelt integration

7. Thoughtful storage and security features

8. A timeless interior

The evolution of the Mercedes R129 interior

The Mercedes-Benz R129 SL-Class was a remarkable step forward in luxury and technology when it was introduced. While many years had passed since its predecessor, the R107 SL, made its debut, the interior of the new model was a testament to timeless design. Unlike the W113 model before it, which aged less gracefully, the R107’s cockpit remained relevant thanks to subtle updates, such as wood trim enhancements and modernized switchgear. This philosophy of evolution rather than revolution carried over to the R129, ensuring its place as a benchmark in automotive luxury.

A balance of tradition and modernity

One of the key reasons for the longevity of the R107’s interior was its conservative yet refined appearance. Mercedes-Benz designers carried this same principle into the R129, but with a sharper, more modern execution. The classic eyeball dash vents were replaced with sleek, rectangular units—two in the center and one at each end of the fascia. The door panels were also reworked, enhancing ergonomics and functionality without compromising the traditional Mercedes-Benz aesthetic.

While some critics lamented the lack of more daring design elements, Daimler-Benz understood its customer base. Rather than chasing fleeting trends, the brand prioritized sophistication, quality, and understated luxury. Buyers of the SL-Class valued craftsmanship and practicality over unnecessary gimmicks and flashy styling.

Inspired by the S-Class

The R129’s interior design was heavily influenced by the contemporary W126 S-Class, while also offering a glimpse into the future W140 model. Sporting elements, such as the redesigned center armrest and crisper door trims, added a dynamic touch. Notably, the R129 featured less wood trim than its predecessor; the dashboard fascia omitted wood entirely, while the burl walnut trim on the center stack wrapped around to form an outer edge—a unique design choice at the time.

Interestingly, Bruno Sacco, the legendary Mercedes-Benz designer, was initially opposed to using wood in the SL’s interior, believing it was more appropriate for sedans. However, market trends—particularly Jaguar’s success in incorporating wood into all models from the early 1980s—likely influenced Mercedes-Benz’s decision to maintain the wood accents.

Safety and ergonomics: A step ahead

From the outset, the R129 was designed with dual airbags—a major advancement in automotive safety. In some markets, the driver’s airbag came as standard, while the passenger-side airbag was optional. Choosing the latter meant sacrificing the glovebox, yet designers managed to compensate by integrating additional storage compartments throughout the cabin.

The steering system also saw significant improvements. Unlike the R107, the new SL featured an adjustable steering column for both height and reach. The power-adjustable version even retracted upon opening the driver’s door, allowing for easier ingress and egress.

Comfort enhancements

Mercedes-Benz significantly upgraded the heating, ventilation, and air-conditioning (HVAC) system in the R129. The controls were simplified, with two dial switches for fan speed and air direction, while high-end models received a fully automatic system with a digital temperature readout and an advanced pollen filter. A unique ‘REST’ function utilized residual engine heat to keep the cabin warm after the engine was turned off—a feature that enhanced comfort, particularly in colder climates.

Revolutionary seating and seatbelt integration

The R129 introduced state-of-the-art seats featuring lightweight, five-piece die-cast magnesium alloy frames. This design not only reduced weight but also provided improved side-impact protection. The seats also housed integrated seatbelts, eliminating the need for traditional B-pillar anchor points. This allowed for a cleaner silhouette while also offering easier access to the rear storage area or optional rear jump-seats.

Adjustability was another area of refinement. Power controls allowed for height, forward-backward movement, and rake angle adjustment, with three-position memory functions that extended to the steering column and power mirrors. Even the seatbelt height was electronically adjustable, further enhancing the vehicle’s ergonomic excellence.

Thoughtful storage and security features

Storage was another area where the R129 improved upon its predecessor. While the loss of the glovebox (in airbag-equipped models) was a trade-off, alternative compartments were cleverly integrated, including a small dashboard storage box and covered bins in the center console and doors. The rear storage compartments, which doubled as a carpeted shelf, featured secure latches for added functionality. Optional 2+2 rear seating was available in select markets, adding versatility.

All models came with electric side windows and the traditional Mercedes-Benz pneumatic central locking system. For added convenience, an optional remote control system could be specified. The central locking mechanism extended to all storage compartments, ensuring security when the car was parked with the top down. A valet parking mode was also available, allowing only storage compartments to be locked while keeping the rest of the vehicle accessible.

A timeless interior

The R129 SL-Class successfully blended tradition with innovation, creating an interior that remained stylish and functional for years. With its thoughtful ergonomics, advanced safety features, and high-quality materials, the cabin of the R129 continues to be admired by enthusiasts and collectors alike. Whether behind the wheel or as a passenger, the experience of an R129 interior remains one of refined luxury and impeccable German engineering.