
BMW has a long history of making cars, going back well before WWII.
Since this FAQ has been built from the contributions to the mailing
list, there is little information about the early cars.
*Modern BMWs started with the 1500, a boxy practical sedan with a 1.5
liter 4 cylinder. *The engine was soon enlarged and the body slightly
redesigned to make the 2002. *This was a small 4 seater with good
handling and a powerful motor. *It is the car which really started
BMW on the path it is today.
*Today BMW has three main lines of cars, 3, 5 and 7. *The 3 series is a
compact sedan with generous front seats and usable rear seats that are
a bit short on leg/head room. *The 5 is a mid-size car which seats 5 in
reasonable comfort. *The 7 is a large luxury car which has occasionally
been named one of the best cars in the world. *In between have been
the 6 series, a luxury coupe built on the 5 series platform, and the 8
series, the follow-on to the 6 but built on a unique platform.
Naming Conventions :
BMW's are named according to their model range, engine size, and other
characteristics (i.e. - 325iX). *The first digit refers to the model range
(3 = 3-series), the following two digits refer to engine displacement
(25 = 2.5 liters), and the letters refer to a distinguishing feature,
body style, or characteristic of the car or engine.
(i = fuel injection, X = four-wheel drive)
A * = automatic
* C * = convertible
* CS *= coupe sport
* i * = injection; international
* e * = ETA (high mpg, high torque, low RPM) engine
* L * = long-wheelbase; luxury
* M * = Motorsport
* s * = sport; also used to denote coupe body in NA markets
* t * = touring; touring could equate to hatchback, wagon, or
* * * * sport versions of early models
* td *= turbodiesel
* tds = intercooled turbodiesel
* X * = four-wheel drive
* Z * = models developed by BMW Technik; new roadster designation
Exceptions to the standard model designations involve models originating
from BMW Motorsport, the racing arm of BMW. *Models produced by this
division have an 'M' prefix followed by the original model range on which
the car is based (M3, M5, M6).
For more info check this site out : Unofficial BMW