
300SL (1954-1963)
In the beginning of the fifties Mercedes-Benz built the 300SL (W194) light racing car which had a chassis built up around thin steel tubes. The six cylinder engine provided an impressive 174bhp.
The 300SL was designed and built as a racing car. Transforming the specially constructed pre-racer into a production automobile was a goal achieved in 1954, and the 300SL Gullwing was officially introduced at the 1954 New York Auto Show by Max Hoffman.
The car was extremely fast but not very convenient to drive and the design of the cabin and "Gullwing" doors made it difficult to enter and exit. A roadster type of the 300SL was later made to compensate for this.
Production stopped in 1963 after having produced 1.853 samples.
190SL (1955-1963)
Along with the 300SL's introduction in 1954, the 190SL was also introduced at the 1954 New York Auto Show as a prototype. Mercedes-Benz recognized a need for a lower priced sports car as an alternative to the expensive 300SL. The 190SL carried a four cylinder engine providing 105 bhp. One year later, the first production version 190SL made its official debut.
In Mercedes-Benz nomenclature, the SL means Sports Light, however the 190SL was not incredibly light. It did, however, have a very attractive, sporty image. It was easy to drive and proved to be a very very reliable touring car with decent performance.
The 190SL was produced from 1955 to 1963 and in total 25,881 were produced.
230SL (1963-1971)
The 230SL was introduced at the Geneva Motor Show in 1963 and effectively replaced both the 300SL and the 190SL. In 1967 it was followed by the 250SL and in 1968 by the 280SL which was slightly more powerful.
With a six cylinder engine and a 150 bhp rating, it was more powerful than the 190SL and more comfortable than the 300SL.
The 230SL can be identified easily by its headlights. The 230SL had the front lights vertically arranged against the newer SL models (W107) which had horizontally arranged front lights.
Production on the 230SL ended in 1971, with a total of 48,912 cars produced.
350SL (1971-1980)
In 1971 Mercedes introduced the 350SL, their heaviest version yet. Its weight no longer qualified it as a "Sport Light" anymore, but it retained the distinction. It carried a V-8 engine and was built as a convertible roadster and a four-seat coupe.
In 1973 both cars were made with a 4.5 liter V-8 engine and from 1974 the more economic 280SL was introduced with a 2.8 liter 6 cylinder with DOHC to address the ongoing oil issue of the day.
(1980-present)
At the Geneva Motor Show in 1980 Mercedes replaced the 350SL with the 380SL. This model represented the official return to power and torque. In 1985 a revamped version of the 280SL was presented at the Frankfurt Show with a 3-liter 6 cylinder engine with an impressive rise in bhp. Within a year, the 380SL motor was overhauled again to provide a 4.2 liter 8 cylinder engine with a badge of 420SL. A 5-liter 500SL with 245 bhp was also introduced, providing more power and better handling than ever before.
The R170-platform SLK 230 Kompressor was introduced in 1997 for model year 1998 to compete with the Porsche Boxster and BMW Z3. Setting it apart was its folding hardtop, though its additional weight dented the performance of the 185 hp 2.3 L supercharged I4 engine and automatic transmission. The SLK was on Car and Driver's Ten Best list for 1997.
Very few toys or scale replicas of this car were produced and parts can also be a bit hard to come by in some markets.
A 5-speed manual transmission was added for 1999, but it was the introduction of a 215 hp 3.2 L V6 and 6-speed manual transmission in the 2001 SLK 320 that really brought the Sportlich to the car.
An AMG model was added in 2001, with a 354 hp supercharged version of the 3.2 L V6. This SLK 32 AMG was the best-performing SLK ever, and was a direct rival of the BMW M Roadster and Porsche Boxster S. It is only offered with automatic transmission. The SLK AMG engine is also hand built.
Not all Mercedes SLKs were built in Bremen, Germany, the SLK 320 being built in South Africa. The very first R170 Mercedes SLK was completed on January 29, 1997 and last on April 7, 2004.
The SLK was updated in 2004 with a new Formula One-inspired appearance and serious performance. For 2005 the new R171-platform SLK was again on Car and Driver's Ten Best list, and it also won the Canadian Car of the Year's Best New Convertible award.
Highlighting its potential appeal to women, New Zealand's Lucire magazine announced it as its 'Car to Be Seen in' for 2005. The current SLK is also built in Bremen, Germany. Both cars have been claimed to be fun to drive with the SLK350 going from 0-60mph in a short 5.4 seconds. There are rumours that Mercedes-Benz is going to produce a SLK 63 AMG model with their new 6.2L naturally aspirated engine designed from scratch by AMG division.