Buick K-Six classic cars for sale

History of the Buick K-Six

Produced between 1916 and 1922, the Buick K-Six emerged during an era of industrial and automotive transformation in the United States. Designed as a luxury vehicle under General Motors, it was intended to bridge the gap between entry-level and ultra-premium offerings—positioning Buick above Chevrolet and Oldsmobile, yet just below Cadillac. Its robust build and reputation for reliability made it a favourite among prosperous motorists, including business leaders and affluent enthusiasts, across the American and international markets.

Model history

The K-Series marked Buick’s commitment to multi-cylinder powerplants, with the K-Six model introducing a 4.0-litre inline-six engine that clearly distinguished it from contemporaries predominantly using four-cylinder configurations. The K 45 Tourer was a prominent variant, delivering open-top grand touring with a four-seat layout. The K-Six’s legacy set the stage for Buick’s further association with refinement and technological innovation, and later models continued to favour straight-six and straight-eight engines before succumbing to the widespread adoption of V8s in subsequent decades.

Highlights of the Buick K-Six

The K-Six distinguished itself with a 4.0-litre straight-six engine producing 60 hp—delivering both ample power and smooth operation thanks to the overhead valve design. The combination of an advanced powertrain and a three-speed manual gearbox, paired with rear-wheel drive, offered genuine driving pleasure at a time when many manufacturers relied on less refined technology. Its mechanical drum brakes on the rear axle and leaf-sprung solid axles were standard for its period, but the model stood out for plush ride quality and refined details. The lavish interior, generous wheelbase of around 3.1 metres, and solid construction emphasised long-lasting performance and comfort.

In the Classic Trader market, the supply and demand statistics indicate that 100% of all Buick classic car listings and inquiries in this segment apply to the K-Six, underscoring both its rarity and its singular status among Buick vehicles of the period.

Technical Data

Special Editions and Collectible Models

Among the variants, the Buick K 45 Tourer is notable for its open four-seat layout, catering to those seeking grand touring comfort and exposure to the elements. Other special editions or factory custom specifications are not widely documented for this era of K-Six production.

Weak Spots and Common Issues

Technical weaknesses typical for most vehicles of this period include the mechanical drum brakes, which require vigilant adjustment and regular maintenance for safe operation—especially since braking is only provided on the rear axle. The leaf-spring suspension, while robust, can be prone to wear and may develop squeaks or need re-bushing. Engine components are sturdy but keeping the overhead valves adjusted and the lubrication system in top condition is crucial. Parts supply can be challenging, so careful sourcing and expert mechanical support are recommended.

Engine, Transmission and Driving Dynamics

Buick’s 4.0-litre straight-six delivers a nominal 60 PS—impressive for the era. Combined with a three-speed manual gearbox and rear-wheel drive, it provides linear acceleration and a true vintage driving feel. The top speed of around 100 km/h puts it ahead of less powerful contemporaries like the Ford Model T. The chassis, featuring leaf-spring solid axles, delivers a balance between comfort and ruggedness, though handling will feel period-correct—demanding precision and mechanical sympathy from the driver. Highlighted variant: Buick K 45 Tourer, open four-seater; competitive technical edge via straight-six motor with 60 PS, more comfort compared to rivals such as Dodge and Ford in the early 1920s.

Interior, Comfort and Exterior Design

The K-Six's design focus was squarely on understated luxury. A spacious interior and high-quality materials—often leather and substantial brightwork—underscored its premium aspirations. The open Tourer provided a sense of high status and freedom for its owners. The combination of a long wheelbase, flowing fenders, and characteristic Buick grille made the K-Six instantly recognisable. Optional extras likely included deluxe trim variants, steering wheel accessories, and fitted luggage, tailored to wealthy buyers of the era.

Other features

Buick’s K-Six was engineered to endure prolonged use—its reputation for durability and lasting build quality resonates even a century after its production. Its positioning under GM's umbrella signalled a blend of available technology, shared platforms, and the reliability that Buick buyers expected at a competitive price.

Summary

The Buick K-Six stands out in the context of early 1920s motoring: straight-six power, crafted comfort, and a place above entry-level and mass-market contemporaries. As supply and demand statistics show, it is the referential classic Buick of its time—highly distinctive, technologically advanced for its era, and historically important for the brand’s development.