e21 : 3 series 1977-1982 (called : shark)
e30: 3 series 1982-1990 (called : asala) also mistakenly the facelift version from 1987 up is called M40
E36 : 3 series 1990-1999 (called debbana )
the e code stands for the MAIM body shape
http://en.wikipedia.org/wiki/Bmw#Series_Generations
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