BMW 3.0 CSi Fuel-Injected Coupe
The BMW 3.0 CSi, produced from 1971 to 1975, represents the zenith of BMW's celebrated E9 coupe platform and one of the most elegant grand tourers of the 1970s. The 'i' suffix — indicating fuel injection, a technology that BMW was among the first to adopt widely — distinguished this model as the most sophisticated in the range, offering smoother power delivery, better fuel economy, and reduced emissions compared to its carbureted siblings.
The E9 body, penned by Wilhelm Hofmeister and built by Karmann in Osnabruck, was a masterpiece of proportion. Its pillarless design created an airy, elegant greenhouse that has aged beautifully, while the signature Hofmeister kink in the rear pillar established a design cue that BMW would use on virtually every model since. The thin roof pillars and expansive glass area gave the 3.0 CSi a lightness of appearance that belied its generous dimensions.
Beneath the long hood sat BMW's legendary M30 inline-six, fitted with Bosch D-Jetronic electronic fuel injection. This 3.0-liter engine produced 200 horsepower — a significant improvement over the carbureted 3.0 CS's 180 hp — delivered with a silky smoothness that set the standard for six-cylinder refinement. The engine's broad torque curve and linear power delivery made the CSi a supremely capable long-distance cruiser, while its willingness to rev provided genuine sporting excitement when asked.
The chassis balanced comfort and handling in a way that was distinctly BMW. The MacPherson strut front and semi-trailing arm rear suspension provided composed, predictable handling with enough compliance to absorb imperfect surfaces without jarring the occupants. Power-assisted steering offered good feedback at speed, while the ventilated front disc brakes provided confident stopping power. A limited-slip differential was available as an option, enhancing traction during spirited driving.
Inside, the 3.0 CSi offered a level of refinement appropriate to its grand touring mission. Leather upholstery, wood trim, electric windows, and a comprehensive instrument panel created an environment that was both luxurious and driver-focused. The seats were supportive enough for fast driving yet comfortable for long journeys, and the sound insulation was notably superior to many contemporaries.
The E9 coupes also served as the basis for BMW's legendary motorsport program. The 3.0 CSL — the lightweight homologation special with its famous 'Batmobile' aerodynamic kit — dominated European Touring Car Championship racing, establishing BMW Motorsport's reputation. The CSi's racing pedigree lent it a sporting credibility that complemented its elegant grand touring character.
Approximately 8,199 CSi models were produced during the car's four-year run, making it rarer than the carbureted CS. Today, the 3.0 CSi is recognized as one of BMW's finest achievements — a car that defined the brand's identity as a maker of sporting luxury cars and established design and engineering traditions that continue to this day.
Rust is the primary enemy — check inner sills, A-pillars, front subframe mounting points, rear shock towers, and trunk floor. The Karmann-built body is more rust-prone than later BMW unibodies. The M30 engine is extremely robust but check for head gasket weep, timing chain stretch, and oil leaks. The D-Jetronic fuel injection system can be finicky but is rebuildable. Verify the car has its correct injection system (many were converted to carburetors). Chrome trim is expensive to reproduce. Check pillarless door glass alignment and window mechanism operation.
The E9 coupe series began with the 2800 CS in 1968. The 3.0 CSi was introduced in 1971 with Bosch D-Jetronic fuel injection, producing 200 hp vs the carbureted 3.0 CS's 180 hp. Bodies were manufactured by Karmann in Osnabruck and shipped to Munich for final assembly. The legendary 3.0 CSL (Leicht/Lightweight) was the homologation special. Total 3.0 CSi production was approximately 8,199 units.