What does Mercedes-Benz 63 mean?

[RyanDella]

Mercedes-Benz 63 refers to the 6.3-liter displacement. When it was first introduced, it featured a naturally aspirated V8 engine with a 6.3-liter displacement. Later, due to European restrictions on large-displacement engines, it was replaced with a 5.5T turbocharged engine. Initially, models like the C63, CL63, and ML63 were introduced with this naming convention. Although the engine was later updated to a 5T turbocharged version, the original name was retained due to its market recognition. For example, the classic 63 model featured the M137 V12 engine, which was also the first engine installed in an AMG model named with "63." The 6.3L displacement became the direct basis for the naming.