all about series vehicles

[jackyshaikh]

Hi,
To all,can any one convince me all about these series vehciles?
what is this all about series engines like Lseries,T series,Kseries,Mseries.
sorry guys this must be very stupid question from me.

[shogun]

E+M numbers
http://www.unixnerd.demon.co.uk/bmw.html