The BMW 628CSi automatic, produced between 1979 and 1982, represents a compelling blend of luxury and performance within the first generation (E24) 6 Series lineup. Positioned as a mid-range offering, it provided a more accessible entry point into the 6 Series range compared to the flagship 635CSi, while still delivering a refined driving experience. This variant was primarily aimed at buyers seeking a comfortable grand tourer with a prestigious badge, prioritizing ease of use over outright track performance. The 628CSi automatic served as a significant model within the E24 series, bridging the gap between the more economical 626CSi (available in some markets) and the higher-performance 635CSi.
Technical Specifications
| Brand | BMW |
| Model | 6 Series |
| Generation | 6 Series (E24) |
| Type (Engine) | 628CSi (184 Hp) Automatic |
| Start of production | 1979 |
| End of production | 1982 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Maximum speed | 200 km/h (124.27 mph) |
| Weight-to-power ratio | 7.9 kg/Hp, 126 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 164.4 Nm/tonne |
| Power | 184 Hp @ 5800 rpm |
| Power per litre | 66 Hp/l |
| Torque | 240 Nm @ 4200 rpm (177.01 lb.-ft. @ 4200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | M30 |
| Engine displacement | 2788 cm3 (170.13 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 86 mm (3.39 in.) |
| Piston Stroke | 80 mm (3.15 in.) |
| Compression ratio | 9.3:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 5.8 l (6.13 US qt | 5.1 UK qt) |
| Coolant | 12 l (12.68 US qt | 10.56 UK qt) |
| Kerb Weight | 1460 kg (3218.75 lbs) |
| Max. weight | 1830 kg (4034.46 lbs) |
| Max load | 370 kg (815.71 lbs) |
| Trunk (boot) space – minimum | 415 l (14.66 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Permitted trailer load with brakes (12%) | 1600 kg (3527.4 lbs) |
| Length | 4755 mm (187.2 in.) |
| Width | 1725 mm (67.91 in.) |
| Height | 1365 mm (53.74 in.) |
| Wheelbase | 2626 mm (103.39 in.) |
| Front track | 1422 mm (55.98 in.) |
| Rear (Back) track | 1487 mm (58.54 in.) |
| Minimum turning circle (turning diameter) | 11.2 m (36.75 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 3 gears, automatic transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Steering type | Worm-reduction unit |
| Tires size | 195/70 VR14 |
| Wheel rims size | 14 |
Powertrain & Engine Architecture
The heart of the 628CSi is BMW’s M30 inline-six engine, specifically the 2.8-liter variant. This engine, known for its smoothness and durability, utilizes a cast iron block and an aluminum cylinder head. The 628CSi employed Bosch L-Jetronic multi-port fuel injection, a significant advancement over earlier carbureted BMW engines, improving fuel efficiency and responsiveness. The engine produces 184 horsepower at 5,800 rpm and 240 Nm (177 lb-ft) of torque at 4,200 rpm. The automatic transmission is a 3-speed unit, designed to provide smooth and effortless gear changes. This transmission was chosen to complement the car’s grand touring character, prioritizing comfort over sporty performance. The automatic was a ZF 3HP22 unit, a common and generally reliable transmission of the era.
Driving Characteristics
The 628CSi automatic delivers a comfortable and refined driving experience. While not as quick as the manual transmission or the 635CSi, it offers ample power for highway cruising and spirited driving. The automatic transmission, while smooth, does result in some power loss compared to the manual counterpart. The gear ratios are tuned for relaxed cruising, with a focus on maximizing fuel efficiency. Acceleration from 0 to 60 mph takes approximately 9.5 seconds, and the top speed is around 124 mph. The car’s weight distribution is well-balanced, contributing to stable handling, but the automatic transmission doesn’t allow for the same level of driver control as a manual. The steering, while not overly direct, provides adequate feedback, and the suspension effectively absorbs bumps and imperfections in the road.
Equipment & Trim Levels
The 628CSi automatic came standard with a generous array of features for its time, including power windows, central locking, and a high-quality sound system. The interior was typically trimmed with cloth upholstery, although leather was available as an option. Standard features also included a sunroof, and air conditioning. Optional extras included upgraded sound systems, a limited-slip differential, and sport suspension. The dashboard layout is classic BMW, with a driver-focused design and clear instrumentation. The trim level largely dictated the interior materials and the inclusion of certain convenience features. A base 628CSi automatic would have been relatively spartan, while a well-optioned example could approach the luxury of a 635CSi.
Chassis & Braking
The E24 6 Series features a robust chassis with independent suspension all around. The front suspension utilizes McPherson struts with coil springs and an anti-roll bar, while the rear suspension employs a semi-trailing arm design with coil springs. The 628CSi is equipped with ventilated disc brakes at the front and solid disc brakes at the rear, providing adequate stopping power for its weight and performance. The steering is a worm-reduction unit, offering a good balance of feel and assistance. The rear suspension geometry was carefully tuned to minimize lift-oversteer, a common characteristic of rear-wheel-drive cars.
Market Reception & Comparison
The 628CSi automatic was generally well-received by automotive critics. It was praised for its comfortable ride, refined engine, and luxurious interior. However, some critics noted that the automatic transmission dulled the driving experience compared to the manual version. Compared to the 635CSi, the 628CSi offered a more affordable entry point into the 6 Series range, but with a noticeable reduction in performance. The 635CSi’s larger engine and sportier suspension provided a more engaging driving experience, but at a higher price point. Fuel economy was reasonable for a car of its size and era, averaging around 18-22 mpg. Reliability was generally good, although maintenance costs could be high due to the car’s complex engineering. The 628CSi aimed to appeal to buyers who prioritized comfort and style over outright performance.
Legacy
Today, the BMW 628CSi automatic is a sought-after classic car. Its combination of style, luxury, and durability has made it a favorite among collectors and enthusiasts. The M30 engine is known for its longevity, and well-maintained examples can still provide years of reliable service. However, finding parts can be challenging, and maintenance costs can be significant. Rust is a common issue, particularly in areas exposed to harsh winters. The 628CSi automatic represents a unique chapter in BMW’s history, offering a glimpse into the era of elegant and refined grand touring cars. Its enduring appeal lies in its ability to deliver a comfortable and enjoyable driving experience, even by modern standards. The automatic version, while not as highly regarded by purists as the manual, offers a more accessible and user-friendly experience for many drivers, contributing to its continued popularity in the classic car market.
