Mercedes-Benz M08 engine
The Mercedes-Benz M08 engine is a naturally-aspirated and supercharged, 4.6-liter and 5.0-liter, straight-8 engine, designed, developed and produced by Mercedes-Benz; between 1928 and 1940. Overview

Typ Nürburg 460 engine (1928–1929) 
The engine was a 4,622cc straight-8 side-valve unit for which maximum output was given as  at 3,400 rpm

Typ Nürburg 460 engine (1929–1932) 
For 1929, the company's first eight-cylinder model was extensively reworked by the newly appointed Technical Director Hans Nibel. The 8-cylinder engine and most other technical details were carried over unchanged from the 1928 car including the ratios chosen for the four-speed manual transmission. Typ Nürburg 500 engine (1931–1933) 
In 1931, the car became available with an enlarged 4,918cc engine which now also featured a twin downdraft carburettor. Maximum output was now listed as  at 3,100 rpm and claimed top speed increased to 110 km/h (69 mph). Typ 500 engine (1932–1936) 
In 1932 the W08 lost the “Nürburg” name, being sold simply as the Mercedes-Benz Typ 500. The 4,918cc  side-valve engine with its twin downdraft carburetor was unchanged, as were the four-speed optional overdrive transmission, wheelbase, and list of standard body types. Typ 500 engine (1936–1939) 
1936 saw an increase in claimed maximum output from the engine to   at 3,300 rpm. The cylinder capacity at 4,918cc was unchanged, but there was a marginal raising of the compression ratio. The claimed top speed was now raised further to 123 km/h (76 mph). The model was discontinued in 1939 without any immediate successor. Twenty-four years passed before the next 8-cylinder engined Mercedes-Benz appeared; with the Mercedes-Benz 600, in 1963. Applications
Mercedes-Benz Nürburg 460 (W08)

References

Mercedes-Benz engines
Straight-eight engines
Engines by model
Gasoline engines by model