As the war progressed, military authorities placed greater stress on the development of air-cooled engines, which they felt had more immunity to damage from weather, shellfire, and misuse. To meet this demand, Opel engineers developed an unusual variation on normal cooling for the 3.6 L truck engine. It was called "air-oil cooling", and used engine oil to take heat away from the jackets around the cylinder barrels. The heads were directly cooled by air, there being three separate aluminium finned heads, each serving two cylinders. Of this interesting engine, which developed 72 hp (54 kW; 73 PS) at 3,000 rpm on 74-octane fuel, only three examples were built.

Rüsselsheim/Geneva. Opel is paving the way to the future by providing even more information, services and safety in cars. The Rüsselsheim-based carmaker is presenting the personal mobility services offered by Opel OnStar – after already announcing the intention to bring Opel OnStar to Europe last year – at the International Motor Show in Geneva (Hall 2, Stand number 2231) ...

The next step for Opel was the resumption of passenger car production. It might have seemed easiest to bring back the Kapitän first since its engine was already in production for the truck, but occupation regulations restricted German civilians to cars of 1.5 L or less, which made the Olympia the obvious candidate. Under Dr Ing e.h. Karl Stief, who had been chief engineer at Opel since 1934, useful changes were made to this tough little car. The Dubonnet front suspension was replaced by a conventional coil-and-wishbone layout and the steering was correspondingly rearranged.


Further information about official fuel consumption, official specific CO2 emissions and consumption of electric energy can be found in the “guideline about fuel consumption, CO2 Emissions and electric energy consumption of new passenger cars” ('Leitfaden über den Kraftstoffverbrauch, die CO2-Emissionen und den Stromverbrauch neuer Personenkraftwagen') in German language, which is available free of charge at any point of sales and at DAT Deutsche Automobil Treuhand GmbH, Helmuth-Hirth-Straße 1, D-73760 Ostfildern. 
The Kadett did seem to be all over in the late 60’s early 70’s time frame, but rapidly dissappeared from the scene by the end of the 70’s. Bay Buick-GMC in Torrance CA. had an Opel sign for many years, at least until the mid-90’s. Maybe they thought Opel was coming back. Back in the early 70’s I remember a family that had a light metallic green Kadett wagon. I though it was cool for no other reason than it was a 2 door wagon.
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The Calibra came with 2.0-litre 16-valve four-cylinder engine from the Family II range with a Cosworth-designed cylinder head that put out a healthy 150bhp, which when combined with the sleek shape gave the Opel a healthy turn of speed. These early cars, which were built until 1993, are becoming desirable as the C20XE engine produced more power than the cleaner X20XEV engines of later cars, which only put out a still credible 136bhp. Other markets got an eight-valve version of the Calibra producing 115bhp. This car was never sold here in Ireland, but it did have the distinction of being the most aerodynamic production car in the world at that time.
Other special jobs were undertaken at the Rüsselsheim factory. One that was too exotic to be typical was the construction of an intercooler for the supercharger of the famous Junkers Jumo aircraft engine. Special methods had to be developed to fabricate this vital assembly from very thin sheets of aluminium. With work like this going on, Germany's enemies naturally took note of the various Opel plants, and starting in August 1944, began attacking them by air. Destruction was heavy at both Rüsselsheim and Brandenburg from the attacks by Allied bombers. Never was the outlook bleaker at Adam Opel AG than in the first months of 1945.

On August 26, 1945, the State Defense Committee published Order № 9905, which prescribed the start of production of the 4-door Kadett on the Moscow small car plant "without any changes to the design". But implementation of the plan was far from smooth. The Rüsselsheim plant had been deeply involved in the Nazi war effort, producing aircraft engines for the Luftwaffe, and consequently has been heavily damaged by the Allied air raids. Very little was left to be salvaged – mostly incoherent drawings and plans, with several stamping dies for the 2-door version of the Kadett to add.[7]
The 5-door Corsa was essentially the same car as the 3-door version with little differences to tell the two apart, except the extra set of doors, of course. Powered by an almost identical range of engines, the 5-door Corsas had a large wheelbase which lead to a trunk volume increase from 9.2 (for the 3-door) to 10 cubic feet. The GSi was not a level equipment to be found among the engine-milder ...
I join in the question: “Where did they all go?” These were pretty common in the upper midwest (as imports went) in the late 60s-mid 70s. I knew a Lutheran minister who owned one (maybe a 69 or so?) in the mid 70s, and got to ride in it once. He seemed pretty proud of the fact that he had put about 80K on it and it seemed to be running strongly. Although it was starting to look a little worn, it seemed to hold up a lot better than my Scoutmaster’s 69 Cortina.
Overcoming these and other obstacles, Opel finally celebrated the completion of the first postwar Opel Blitz truck on 15 July 1946 in the presence of United States Army General Geoffrey Keyes and other local leaders and press reporters.[17] Priced at 6600RM, the truck was designed to run either on gasoline or on wood gas, for which a gas generator could be supplied. With a ceremonial bouquet of flowers flying from its rear-view mirror, this historic Opel Blitz left the factory gate bound for a buyer in Wiesbaden on 26 July. Further production followed at a rate of 150 a month, and by the end of 1946, the production total was 839. Frigidaire refrigerators were also being made at Rüsselsheim, as were Olympia engines for the NSU Kettenkrad.
During the 1930s, the Rüsselsheim plant was never given a major role in Germany's war preparations. Neither was Ford's plant in Cologne considered trustworthy enough for a big assignment, such as tank manufacture, in view of their earlier foreign associations. Initially, of course, the war was thought to be a short one settled in Germany's favour. Auto plants were shut down, to conserve resources, but not converted to other jobs. As was common with much of the production in Nazi Germany during the war, slave labor of deported civilians and Soviet POWs was utilized in the Opel factories.
The motor's all new as well. At least, this 114bhp one is. Like Ford, Vauxhall now has its own 1.0-litre, three-cylinder turbo petrol unit. The rest of the range is made up of mainly petrol engines, with only a 1.3-litre diesel in 74bhp and 94bhp to choose from the oilburning fratenity. The gasoline line-up starts with a duo of naturally aspirated 1.4-litre engines producing 74bhp, and 89bhp  respectively, followed by a pair of blown 1.4-litre units producing 99bhp and 148bhp, while the Corsa VXR gets a 202bhp 1.6-litre turbocharged petrol engine.
The saloon model was built and sold in Latin America as the Chevrolet Corsa Classic until 2010, when it was replaced with the model previously released for China in 2005 as the Buick Sail. A budget version introduced for the Brazilian market, the Chevrolet Celta, has bodywork resembling the end of the 1990s Vectra and Astra. The Celta was sold in Argentina as the Suzuki Fun for a certain period.
Acceleration and braking benefit from every kg saved. Lightweight design is therefore strategically important at Opel. The current Opel Astra, which premiered in 2015, set new standards in this respect. The 2016 “European Car Of The Year” is up to 200kg lighter than its predecessor. As a result, the agility and ride comfort of the Astra are significantly improved; throttle reaction is more responsive, the steering reacts more dynamically, the driving experience is more engaging. The weight reduction will have a similar effect on the new Corsa.
Under the hood, the ROCKS shares the 1.0-liter, three cylinder gasoline engine (NEDC fuel consumption: urban 5.6-5.2 l/100 km, extra-urban 4.2-4.0 l/100 km, combined 4.7-4.4 l/100 km; 106-101 g/km CO2) of its KARL sibling The unit delivers 55 kW/75 hp and is paired to a five-speed manual gearbox as standard. Alternatively, KARL ROCKS buyers can choose the optional Easytronic® 3.0 gearbox. The five-speed automated transmission combines the comfort advantages of an automatic transmission with the efficiency of a manual gearbox. It automatically selects the appropriate gear for best possible fuel consumption, but is based on a manual transmission optimized for smaller engines which enables ultra-economical driving. The driver can take manual control of Easytronic 3.0 at any time by pulling or pushing the gear selector lever.
In response to the pressing need for new trucks in a Germany struggling to rebuild, the American authorities governing Rüsselsheim granted permission to the plant to produce a 1.5-short-ton (1.4 t) truck powered by the 2.5 L Kapitän engine. It was a minor miracle that even this was possible. By January 1946, the plant was ready to build trucks, but many of the almost 12,000 parts needed to make each one was lacking. Before the big firms could begin, the small ones had to get started, too. Illness and poor nutrition so crippled the staff of 6,000 workers that it was normal for 500 to be too sick to come to work and more than 400 to report sick during the day.

The Opel Karl is powered by a new 1.0-liter turbocharged Ecotec three-cylinder making 74 hp, a bit less than the outgoing Chevrolet Spark’s 84 hp from a 1.2-liter four-cylinder. The three-cylinder engine is part of GM’s new global, small-displacement Ecotec engine family, so it’s possible that Chevrolet may offer a slightly larger turbocharged engine for the Spark in the U.S. The European-market Opel is also available only with a five-speed manual, while the Spark will almost surely be offered with an automatic transmission option. 

But how was Opel/PSA able to shave off so much fat from the hatchback? For starters, all engines will be made from aluminum (-15 kg / 33 lbs), much like the hood (-2.4 kg / 5.3 lbs). The optimized seats (-5.5 kg / 12.1 lbs front and -4.5 kg / 10 lbs rear) contribute to this significant weight loss, while the insulating material used throughout the cabin is also a new weight-saving development. The most important diet is found in the body-in-white, which is a term referring to the body panels being joined together before adding the engine, sub-assemblies, and trim. The new BIW is an impressive 40 kg (88 lbs) lighter than the old one.
Opel also produced the first mass-production vehicle in Germany with a self-supporting ("unibody") all-steel body, closely following the 1934 Citroën Traction Avant. This was one of the most important innovations in automotive history.[15] They called the car, launched in 1935, the Olympia. With its small weight and aerodynamics came an improvement in both performance and fuel consumption. Opel received a patent on this technology.[citation needed]
Design-trimmed cars lose the alloys and get 15in steel wheels, while SE models gain an anti-dazzle rear-view mirror, electrially adjustable front seats, a 60/40 folding rear bench split, parking sensors and 16in alloy wheels, whole the range-topping Elite models include luxuries climate control, rear view camera, bi-xenon headlights, tinted rear windows, sports suspension and 17in alloy wheels.
All Mexican previous versions were known as the Chevy, with the names Monza used on the saloon, and Swing (five-door) and Joy (three-door) for the hatchbacks, all with a 1.6-liter 78 PS (57 kW) four-cylinder. There was also a low-end three-door model called the Chevy Popular, which was equipped with a 52 PS (38 kW) 1.4-liter engine.[31] The latter 2004 and 2008 redesigns were simply named Chevy and Chevy Sedán. The Chevy was a favourite among taxicab drivers and one of the best selling cars in the country.
In 1994 a 167 hp 2.5 L V6 was introduced, thus creating what many considered to be the finest Calibra to date. Available with both manual and automatic transmissions, the V6 wasn’t as fast as the Turbo, but was rather more civilised, and proved to be more reliable than the complex four-wheel drive model with its notorious transfer box issues. 1995 saw the introduction of the the X20XEV Ecotec engine, a cheaper, less reliable derivative of the classic X20XE 16-valve or "red top" engine. This marked a reduction in power from 156 bhp to 136 bhp for the 16-valve version, although the Turbo continued with the C20LET.
However, Opel Team Joest was in for a tough fight. Not only had Alfa Romeo not been sitting on their hands, Mercedes-Benz had finally found the time to build a proper Class 1 car. Although the C180 V6 DTM lacked four wheel drive and only produced 400 horsepower, it featured a 6-speed sequential transmission, F1-derived active suspension, an innovative active ballast system which counteracted the pitching and diving of the nose under acceleration and braking and an all-carbon bodyshell bringing weight down to 980 kg (2161 lbs).
Within Opel the Calibra was a car with potential but sadly much of it was unrealised. Valmet Automotive in Finland, who had a manufacturing facility that build Calibras alongside the German plant, produced two handsome convertible prototypes that never saw production. A Saab coupe based on the Calibra was also rumoured but, again, never saw the light of day.
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