Lets look at some examples from Mercedes/VW/Audi
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C-Class: W202, W203, W204, W205, W206
E-Class: W210, W211, W212, W213
S-Class: W220, W221. W222, W223
Golf: Mk1, Mk2, Mk3 ..... Mk9
Passat: B1, B2, B3.... B9
A4: B5, B6, B7, B8, B9
A6: C4, C5, C6, C7, C8
All nicely sequential running numbers. Then we come to BMW and Porsche
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3 Series: E21, E30, E36, E46, E90, F30, G20
5 Series: E28, E34, E39, E60, F10, G30, G60
911: Type 930, 964, 993, 996, 997, 991, 992
Does anybody know how the boffins at Porsche and BMW decide on their model codes? It looks so random and... un-German