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Mercedes-Benz W108/W109

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Mercedes-Benz W108
Overview
ManufacturerDaimler-Benz
Production1965–1972 (1973 North America only)
383,361 built
W108: 364,699
W109: 18,662
(incl. 300 SEL 6.3: 6,526)[1]
AssemblyWest Germany: Stuttgart
DesignerPaul Bracq , Friedrich Geiger (1963)
Body and chassis
ClassFull-size luxury car (F)
Body style4-door sedan
LayoutFR layout
RelatedMercedes-Benz W113
Mercedes-Benz W114/W115
Powertrain
Engine
Transmission3-speed automatic
4-speed manual
5-speed manual
4-speed automatic
Chronology
PredecessorMercedes-Benz W111 (W108)
Mercedes-Benz W112 (W109)
SuccessorMercedes-Benz W116

The Mercedes-Benz W108 and W109 are luxury cars produced by Mercedes-Benz from 1965 through to 1972 (or 1973 in North America). The line was an upgrade of the Mercedes-Benz W114/W115, to succeed the W111 and W112 fintail sedans. The cars were successful in West Germany and in export markets including North America and Southeast Asia. During the seven-year run, a total of 383,361 units were manufactured.

Since the W108 and W109 were only available as 4-door models, similarly squarish 2-door W111 and W112 coupés and cabriolets, without pronounced tailfins, filled those niches and are frequently mistaken for W108/109 two-doors.

Model history

Mercedes-Benz 280 SE W108
Since the W108 and W109 were only available as 4-door models, 2-door W111 and W112 coupés and cabriolets, like this 1969 280 SE, are frequently mistaken for them.

The car's predecessors, the Mercedes-Benz W111 (1959–71) and W112 (1961–67), helped Mercedes-Benz develop greater sales and achieve economy of scale production, reducing both manufacture time and cost. Throughout the 1950s, Mercedes-Benz had been producing the coachwork 300 S and 300 SL and all but hand-built 300 Adenauers alongside conveyor assembled Pontons (190, 190 SL and 220) etc. Unifying the entire Mercedes-Benz range into the fintail (Template:Lang-de) reduced production onto a single automobile platform.

However, fashion trends in the early 1960s changed rapidly. By the time the Paul Bracq-designed 2-door coupé and cabriolet W111s were launched, the predecessor W111 sedan's fins lost their chrome trim and sharp appearance. The arrival of the W113 'Pagoda' coupé and cabriolet in 1963 saw them further buried into the trunk's contour. Finally, they disappeared completely on the W100 600 in 1963.

The evolution of the W111 began under the leadership of Bracq in 1961 and ended in 1963. Although the fins' departure was the most visible change, the W108 had a lower body waist line and increased glass area - the windscreen alone was 17% larger than W111's - prominent enough to be referred to as a "greenhouse". The cars had a 60 mm lower ride and 15 mm wider doors. The result was a visibly newer-looking, sleeker car with an open and spacious interior.[2]

Differences between W108 and W109

Due to the success of long wheelbase 300 SE Lang (W112), which was intended as an interim car between 300 "Adenauer" (W189) and "Grosser Mercedes" 600 (W100), Mercedes-Benz continued to offer two wheelbase lengths for W108/W109. Initially, the wheelbase lengths denoted W108 (standard) and W109 (long). For 1968 model year, this distinction changed with the introduction of 280 SEL that retained W108, rather than W109, chassis designation.

The larger 3-litre six-cylinder inline engine (300 SEL) were exclusive to W109 with odd exception of standard wheelbase 300 SEb (1965–1967), which was designated as W108. The smaller six-cylinder inline engines (250 S/SE and 280 S/SE/SEL) were assigned to W108 only. Both eventually received the V8 engines in 1967 (W109) and 1970 (W108).

W109 was more luxuriously appointed than W108, featuring burled walnut dashboards, automatic transmission, and power windows along with optional air conditioning system. Most obvious distinction from the W108 were door window frames and a-pillars fully finished with polished metal bright trim.

The W108 and W109 had different types of suspension systems: W108 retained the steel coil springs and oil-filled shock absorbers while W109 used the self-levelling air suspension.

First Series, 1965–1967

W109 300 SEL
The simple elegance, large greenhouse, and practicality of the W108/W109 design is regarded by many as iconic

The W108/W109 premiered at the Frankfurt Auto Show in 1965. The initial model range consisted of three W108s (250 S, 250 SE, and 300 SEb) and a sole W109 (300 SEL). The inline-six engines were carried over from the previous generation with mechanical refinements. The 2.2-litre M180 engine was enlarged to 2.5 litres while the fuel-injected 3-litre M189 version was carried over from "300 Adenauer".

The 250 S was fitted with 2,496 cc M108 engine with dual two-barrel downdraft carburettors producing 96 kW (131 PS; 129 bhp) at 5,400 rpm. It could accelerate to 100 km/h (62 mph) in 13 seconds for manual and 14 for automatic. The top speed was 182 km/h (113 mph) for manual and 177 km/h (110 mph) for automatic. The 250 SE had the same engine as 250 S except for fuel injection system and different engine designation (M129). With increased engine output of 110 kW (150 PS; 148 bhp) at 5,500 rpm, 250 SE was one second faster to 100 km/h than 250 S and had higher top speed of 193 km/h (120 mph) for both manual and automatic versions.

Both 300 SEb and 300 SEL were fitted with 2,966 cc M189 engine. The engine was an updated version of M186, originally developed in 1951 for Type 300 "Adenauer", with Bosch mechanical fuel-injection system that calibrated the optimal fuel mixture automatically based on throttle pedal position and movement, engine speed, atmospheric pressure, water temperature, and driving conditions. The engine's output was 125 kW (170 PS; 168 bhp) at 5,400 rpm, and 300 SEb and 300 SEL could accelerate to 100 km/h (62 mph) in 12 seconds and reach the top speed of 200 km/h (124 mph) (195 km/h (121 mph) with automatic transmission).

The production figures for the first series from 1965 to 1967 showed 129,858 of 250 S/250 SE and 5,106 of 300 SEb/300 SEL. The tiny production figure of 300 SEb/300 SEL reflected the higher sales price with luxurious appointments, exclusivity, and smaller global market share.

300 SEL 6.3

Outwardly, the W109-based 6.3 appeared like any other 300 SEL. Its performance was another matter.

In 1966 company engineer Erich Waxenberger transplanted a massive 6.3 L Mercedes-Benz M100 V8 from the company's flagship 600 (W100) into a W109 chassis, creating the first Q-car from Mercedes-Benz. Full-scale production of 300 SEL 6.3 began in December 1967. 300 SEL 6.3 could reach 100 km/h (62 mph) in 6.5 seconds and the top speed of 220 km/h (137 mph), making it the quickest production sedan, a title it held for many years.

Second Series, 1967–1972

A W108 in France with selective yellow headlights
A 280 SE from July 1972 with a standard straight-six engine
A late model 280 SE 3.5, with a 3.5 V8 engine

To coincide with the launch of new cheaper executive, W114/115 "/8" (Stroke Eight) models, slotted below MB's W108 and W109, the inline six engine range was revised in 1967. The 2.5-litre engine was enlarged to 2,778 cc (2.8 litres) and renamed as M130 for both carburetted (103 kW (140 PS; 138 bhp)) and fuel injected 118 kW (160 PS; 158 bhp) versions.

250 S and 250 SE were renamed as 280 S and 280 SE in November 1967 while 250 S was still offered in some export markets until March 1969. In January 1968, a long wheelbase variation, 280 SEL, was introduced for the first time. The 280 S could reach 100 km/h (62 mph) in 12.5 seconds and top speed of 185 km/h (115 mph), or 180 km/h (112 mph) with automatic transmission. The 280 SE and 280 SEL accelerated to 100 km/h (62 mph) in 10.5 seconds with top speed of 193 km/h (120 mph) and 190 km/h (118 mph) respectively.

The standard wheelbase 300 SEb was dropped while 300 SEL 2.8 obtained 2.8-litre engine with higher output 125 kW (170 PS; 168 bhp), replacing the M186 engine. The acceleration to 100 km/h (62 mph) was 10.5 seconds, and the top speed was 200 km/h (124 mph).

Following the strong reception of limited production V8-powered 300 SEL 6.3 in 1967, Mercedes-Benz offered the all-new 3.5-litre M116 V8 engine with new Bosch D-Jetronic electronic fuel injection in 1969. The V8 engine would move W108/W109 further upmarket in many export markets and allow them to be more competitive in the United States where many passenger vehicles, especially the American luxury marques, were fitted with V8 engines. The new 147 kW (200 PS; 197 bhp) V8 engine was first fitted to W109 in August 1969 as 300 SEL 3.5 then to W108 in July 1970 as 280 SE/SEL 3.5.

The 3.5-litre V8 engine was bored out to 4,520 cc (4.5 litres) as to compensate for the loss of power following the changes in emission control regulations and due to lower fuel octane rating in the United States. The larger V8 engine was designated as M117 and had the same output figures as 3.5-litre V8 engine. It was initially exclusive for the United States, introduced in the spring of 1971, as the 280 SE/SEL 4.5 and the 300 SEL 4.5, until the new, 1973 model year W116, MB's first generation of distinct S-Class platform 450 SE/SEL models, which went on sale worldwide in September 1972, alongside the V8 powered 350/450 SL (R107) 2-seat cabrios and the 350/450 SLC (C107) 4-seat luxury coupes.

The 300 SEL 2.8 was dropped in January 1970 since the 300 SEL 3.5 was selling better and had better performance. The production of 280 SEL ended in April 1971, leaving 280 S and 280 SE as sole models with six-cylinder inline engines until the end of W108/W109 production in 1972, following the introduction of W116.

Transmission

The standard transmission for Europe was a four-speed manual gearbox. A four-speed automatic option was also available. Unusual among mainstream European automakers of the time, Mercedes developed and built their own automatic transmission system.[3] A five-speed manual gearbox was offered for six-cylinder inline engines only from 1969 to 1972, though a few customers opted for it.

When the 3.5-litre V8 engine was introduced in 1969, the sole transmission choice was a four-speed automatic with fluid coupling. The customers could request the four-speed manual transmission with price reduction if they inclined so. As for 4.5-litre V8 engine for the United States, the transmission was three-speed automatic with torque converter.

Models

W108

Model Chassis code Production date Number built Engine
250 S W108.012 07/65–03/69 74,677 2.5 L M108 I6
250 SE W108.014 08/65–01/68 55,181 2.5 L M129 I6
300 SEb W108.015 08/65–12/67 2,737 3.0 L M189 I6
280 S W108.016 11/67–09/72 93,666 2.8 L M130 I6
280 SE W108.018 11/67–09/72 91,051 2.8 L M130 I6
280 SEL W108.019 01/68–04/71 8,250 2.8 L M130 I6
280 SE 3.5 W108.057 07/70–09/72 11,309 3.5 L M116 V8
280 SEL 3.5 W108.058 06/70–08/72 951 3.5 L M116 V8
280 SE 4.5 W108.067 04/71–11/72 13,527 4.5 L M117 V8
280 SEL 4.5 W108.068 05/71–11/72 8,173 4.5 L M117 V8

W109

Model Chassis code Production date Number built Engine
300 SEL W109.015 09/65–12/67 2,369 3.0 L M189 I6
300 SEL W109.016 12/67–01/70 2,519 2.8 L M130 I6
300 SEL 6.3 W109.018 12/67–09/72 6,526 6.3 L M100 V8
300 SEL 3.5 W109.056 08/69–09/72 9,483 3.5 L M116 V8
300 SEL 4.5 W109.057 05/71–10/72 2,533 4.5 L M117 V8

Timeline

Type Chassis 1965 1966 1967 1968 1969 1970 1971 1972
Sedan W108 250 S
250 SE
280 S
280 SE
280 SEL
300 SEb
280 SE 3.5
280 SEL 3.5
280 SE 4.5
280 SEL 4.5
W109 300 SEL
300 SEL 3.5
300 SEL 4.5
300 SEL 6.3

Technical info

Technical data Mercedes-Benz W108[1] (Manufacturer's figures except where stated)
Mercedes-Benz 250 S
(W108 II)
250 SE
(W108 III)
300 SE
(W108 IV)
280 S
(W108 V28)
280 SE
(W108 E28)
280 SEL
(W108 E28)
280 SE 3.5 (W108 E35)†
Chassis code:  W108.012 W108.014 W108.015 W108.016 W108.018 W108.019 W108.057
Produced:  07/65 – 03/69 08/65 – 01/68 08/65 – 12/67 11/67 – 09/72 01/68 – 04/71 07/70 – 09/72
Units:  74,677

55,181

2,737
(includes 300 SEL)
93,666 91,051 8,250 11,309
Engine: 2497 cc M108 I6 2497 cc M129 I6 2996 cc M189 I6 2778 cc M130 I6 3499 cc M116 V8
Bore x Stroke:  82 mm (3.2 in) x 78.8 mm (3.1 in) 85 mm (3.3 in) x 88 mm (3.5 in) 86.5 mm (3.4 in) x 78.8 mm (3.1 in) 92 mm (3.6 in) x 65.8 mm (2.6 in)
Max. Power at rpm:  130 PS (96 kW; 128 hp) at 5,400 150 PS (110 kW; 148 hp) at 5,500 170 PS (125 kW; 168 hp) at 5,400 140 PS (103 kW; 138 hp) at 4,200 160 PS (118 kW; 158 hp) at 5,500 160 PS (118 kW; 158 hp) at 5,500 200 PS (147 kW; 197 hp) at 5,800
Max. Torque at rpm:  194 N⋅m (143 lb⋅ft) at 4000 216 N⋅m (159 lb⋅ft) at 4,200 250 N⋅m (184 lb⋅ft) at 4,000 223 N⋅m (164 lb⋅ft) at 3,600 240 N⋅m (177 lb⋅ft) at 4,250 240 N⋅m (177 lb⋅ft) at 4,250 286 N⋅m (211 lb⋅ft) at 4,000
Compression Ratio:  9.0: 1 9.5: 1 8.8: 1 9.0: 1 9.5: 1 9.5: 1 9.5: 1
Fuel feed:  Two 2-bbl Zenith 35/40 Mechanical Bosch injection Two 2-bbl Zenith 35/40 Mechanical Bosch injection Bosch D-Jetronic
Fuel tank capacity:  82 L (21.7 US gal; 18.0 imp gal)
Valvetrain:  SOHC, duplex chain SOHC, duplex chain SOHC, duplex chain
Cooling:  Water
Gearbox:  4-speed manual w/ column or floor shifter or 4-speed automatic
rear wheel drive, standard axle ratio 3.92:1 or 3.69:1 (V8: 3.46:1)
Electrical system:  12 volt
Front suspension:  Double wishbones, coil springs, stabilising bar
Rear suspension::  Low-pivot swing axle, radius arms, coil springs
Brakes:  Disc brakes (Ø 273 mm (10.7 in) front, 279 mm (11.0 in) rear), power assisted
Steering:  Recirculating ball steering, manual or servo-assisted
Body structure:  Sheet steel, monocoque (unibody) construction
Dry weight:  1,470 kg (3,241 lb) 1,510 kg (3,329 lb) 1,575 kg (3,472 lb) 1,520 kg (3,351 lb) 1,560 kg (3,439 lb) 1,575 kg (3,472 lb) 1,610 kg (3,549 lb)
Loaded weight:  1,940 kg (4,277 lb) 1,980 kg (4,365 lb) 2,060 kg (4,542 lb) 1,960 kg (4,321 lb) 1,985 kg (4,376 lb) 2,000 kg (4,409 lb) 2,055 kg (4,530 lb)
Track front/
rear: 
1,482 mm (58.3 in) / 1,485 mm (58.5 in)
Wheelbase:  S/SE: 2,750 mm (108.3 in)
SEL: 2,850 mm (112.2 in)
Length:  S/SE: 4,900 mm (192.9 in)
SEL: 5,000 mm (196.9 in)
Width:  1,810 mm (71.3 in)
Height:  1,440 mm (56.7 in)
Tyre/Tire sizes:  7.35 H 14 or 185 HR 14 185 VR 14
Top speed:  182 km/h (113 mph) 193 km/h (120 mph) 200 km/h (124 mph) 185 km/h (115 mph) 193 km/h (120 mph) 190 km/h (118 mph) 210 km/h (130 mph)
Fuel Consumption (estimate):  15.5 litres per 100 kilometres (18.2 mpg‑imp; 15.2 mpg‑US) 18.0 litres per 100 kilometres (15.7 mpg‑imp; 13.1 mpg‑US) 10.5 litres per 100 kilometres (27 mpg‑imp; 22 mpg‑US) 11 litres per 100 kilometres (26 mpg‑imp; 21 mpg‑US) 18.5 litres per 100 kilometres (15.3 mpg‑imp; 12.7 mpg‑US)
Price Germany
USA: 
DM 15,300
$5,747[4]
DM 16,850
$6,385
DM 21,500
$8,048
DM 17,000
$5,897
DM 18,600
$6,222
DM 21,230
$6,622
DM 24,920
$10,076
Notes: North American version (280 SE/SEL 4.5: approx 22,000 units) with 4.5 liter V8, 195 hp/278 lb ft
Technical data Mercedes-Benz W109[1] (Manufacturer's figures except where stated)
Mercedes-Benz 300 SEL (W109 III) 300 SEL (W109 E28) 300 SEL 3.5 (W109 E35/1)† 300 SEL 4.5 (W109 E45) 300 SEL 6.3 (W109 E63)
Chassis code W109.015 W109.016 W109.056 W109.057 W109.018
Produced:  09/65 – 12/67 12/67 – 01/70 08/69 – 09/72 05/71 – 10/72 12/67 – 09/72
Units: 2,369 2,519 9,483 2,533 6,526
Engine: 2996 cc M189 I6 2778 cc M130 I6 3499 cc M116 V8 4520 cc M117 V8 6333 cc M100 V8
Bore x Stroke:  85 mm (3.3 in) x 88 mm (3.5 in) 86.5 mm (3.4 in) x 78.8 mm (3.1 in) 92 mm (3.6 in) x 65.8 mm (2.6 in) 92 mm (3.6 in) x 85 mm (3.3 in) 103 mm (4.1 in) x 95 mm (3.7 in)
Max. Power at rpm:  170 PS (125 kW; 168 hp) at 5,400 170 PS (125 kW; 168 hp) at 5,750 200 PS (147 kW; 197 hp) at 5,800 198 PS (146 kW; 195 hp) at 4,500 250 PS (184 kW; 247 hp) at 4,000
Max. Torque at rpm:  250 N⋅m (184 lb⋅ft) at 4,000 240 N⋅m (177 lb⋅ft) at 4,500 286 N⋅m (211 lb⋅ft) at 4,000 358 N⋅m (264 lb⋅ft) at 3,000 500 N⋅m (369 lb⋅ft) at 2,800
Compression Ratio:  8.8: 1 9.5: 1 9.5: 1 8.0: 1 9.0: 1
Fuel feed:  Mechanical Bosch injection Bosch D-Jetronic Mechanical Bosch injection
Fuel tank capacity:  82 L (21.7 US gal; 18.0 imp gal) 105 L (27.7 US gal; 23.1 imp gal)
Valvetrain:  SOHC, duplex chain
Cooling:  Water
Gearbox:  4-speed manual w/ column or floor shifter or 4-speed automatic
rear wheel drive, standard axle ratio 3.92:1 or 3.69:1 (V8: 3.46:1)
3-speed automatic
rear wheel drive, standard axle ratio 3.23:1
4-speed automatic
rear wheel drive, standard axle ratio 2.85:1
Electrical system:  12 volt
Front suspension:  Double wishbones, air springs, rubber springs, stabilising bar
Rear suspension::  Swing axle, radius arms, air and additional rubber springs
Brakes:  Disc brakes (Ø 273 mm (10.7 in) front, 279 mm (11.0 in) rear), power assisted
Steering:  Recirculating ball steering, servo-assisted
Body structure:  Sheet steel, monocoque (unibody) construction
Dry weight:  1,655 kg (3,649 lb) 1,695 kg (3,737 lb) 1,730 kg (3,814 lb) 1,759 kg (3,878 lb) 1,830 kg (4,034 lb)
Loaded weight:  2,140 kg (4,718 lb) 2,120 kg (4,674 lb) 2,170 kg (4,784 lb) 2,222 kg (4,899 lb) 2,265 kg (4,993 lb)
Track front/
rear: 
1,482 mm (58.3 in)
1,485 mm (58.5 in)
1,482 mm (58.3 in)
1,490 mm (58.7 in)
Wheelbase:  2,850 mm (112.2 in)
Length:  5,000 mm (196.9 in)
Width:  1,810 mm (71.3 in)
Height:  1,440 mm (56.7 in) 1,470 mm (57.9 in)
Tyre/Tire sizes:  185 HR 14 185 VR 14 195 VR 14 or

(205/70 VR 14)

Top speed:  200 km/h (124 mph) 195 km/h (121 mph) 200 km/h (124 mph) 205 km/h (127 mph) 221 km/h (137 mph)
Fuel Consumption (estimate):  18.0 litres per 100 kilometres (15.7 mpg‑imp; 13.1 mpg‑US) 16.5 litres per 100 kilometres (17.1 mpg‑imp; 14.3 mpg‑US) 18.5 litres per 100 kilometres (15.3 mpg‑imp; 12.7 mpg‑US) 16.3 litres per 100 kilometres (17.3 mpg‑imp; 14.4 mpg‑US) 21.0 litres per 100 kilometres (13.5 mpg‑imp; 11.2 mpg‑US)
Price Germany
USA: 
DM 28,600
$9,910[4]
DM n.a.
$9,400
DM 31,025
$11,327
DM N/A
$11,327
DM 39,160
$15,122
Notes: North American version (300 SE/SEL 4.5: approx 2,500 units) with 4.5 liter V8, 195 hp/278 lb ft (MY 1972)

See also

References

Notes

  1. ^ a b c Deutsche Autos, Band 4, 2001.
  2. ^ Koehling, Bernd S. "Mercedes 250S, SE W108: Mercedes elegance at its best". Benz Books. Retrieved 15 March 2015.
  3. ^ Garnier, Peter, ed. (2 February 1967). "Autocar Road Test: Mercedes-Benz 250 SE". Autocar. 126 (3703): 17–23.
  4. ^ a b Covello, Mike (2002). Standard Catalog of Imported Cars 1946-2002. Iola: Krause Publication. pp. 533–536. ISBN 0-87341-605-8.

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  • Rohde, Michael; Koch, Detlef (2000). Mercedes-Benz. Typenkompass series (in German). Vol. Band 1. Personenwagen 1945 - 1975 [Volume 1. Passenger Cars 1945 - 1975]. Stuttgart: Motorbuch Verlag. ISBN 361302019X.
  • Schlegelmilch, Rainer W. [in German]; Lehbrink, Hartmut; von Osterroth, Jochen (2013). Mercedes (revised ed.). Königswinter, Germany: Ullmann Publishing. ISBN 978-3-8480-0267-2.
  • Storz, Alexander F. (2016). Mercedes-Benz W 108/109 (in German). Stuttgart: Motorbuch Verlag. ISBN 9783613039063.
  • Taylor, James (1985). Mercedes-Benz since 1945: A Collector's Guide. Vol. 2: The 1960s. Croydon, UK: Motor Racing Publications. ISBN 0-900549-96-3.

Workshop manuals

  • Ball, Kenneth (1972). Mercedes-Benz 280, 1968-72 Autobook: Workshop Manual for Mercedes-Benz 280 S, 280 SE, 280 SEL, 280 SL, 1968-72. Brighton, UK: Autopress. ISBN 0851472931.
  • Chilton Automotive Editorial Staff (1974). Mercedes-Benz: 1968-73 All 220, 230, 250, 280, 300, 350 and 450 models, gasoline and diesel engines. Chilton's Repair & Tune-Up Guide Series. Radnor, PA, USA: Chilton Book Co. ISBN 0-8019-5907-1.
  • Freeman, Kerry A.; Rivele, Richard J.; Hallinger, Jeffrey W., eds. (1983). Mercedes-Benz: 1959-70 All 190, 200, 220, 230, 250, 280 and 300 models, gasoline and diesel engines. Chilton's Repair & Tune-Up Guide Series. Radnor, PA, USA: Chilton Book Co. ISBN 0801960657.
  • Haynes, John H.; Strasman, Peter G. (1987). Mercedes-Benz 230, 250 and 280 1968-1972: 6-Cylinder sohc Sedan, Coupe, Roadster. Haynes Service and Repair Manual Series. Sparkford, UK; Newbury Park, Calif., USA: Haynes Publishing. ISBN 9780856963469.
  • Slade, Tim (2004). Original Mercedes-Benz Coupes, Cabriolets and V-8 Sedans, 1960-1972: The Restorer's Guide. Osceola, WI, USA: Motorbooks International. ISBN 0760319529.
  • Mercedes-Benz Technical Companion. Cambridge, MA, USA: Bentley Publishers. 2005. ISBN 978-0-8376-1033-7.