Sorting through

this list and filtering out all the concept cars and whatnot, it seems glaringly obvious to me that the numbers during the 'E' (Entwicklung) era were assigned based on the order the projects were finished and deemed ready for production. Skipped numbers were failed experiments; two of the more noticeable blocks were the E13 - E19 and E40 - E45 designations, none of which were used on a production car.

E3: 2500 - 3000 Si, introduced 1968

E6: x02 series touring, introduced 1971

**but finalized in 1968 by Baur**
E9: 2.5 CS - 3.0 CSL, introduced 1968

E12: 5-series, introduced 1972

E20: 2002 Turbo, introduced 1973

E21: 3-series, introduced 1975

E23: 7 series, introduced 1977

**but finalized in April 1976**
E24: 6-series, introduced 1976

E26: M1, introduced 1978

E28: Second generation 5-series, introduced 1981

E30: Second generation 3-series, introduced 1982

E31: 8-series, introduced 1989

**but finalized in 1986**
E32: Second generation 7-series, introduced 1986

E34: Third generation 5-series, introduced 1987

E36: Third generation 3-series, introduced 1990

E38: Third generation 7-series, introduced 1994

E39: Fourth generation 5-series, introduced 1995

E46: Fourth generation 3-series, introduced 1998

E50: Mini, introduced 2001

**but finalized in 1998**
E52: Z8, introduced 1999

E53: X5, introduced 1999

Click to expand...