Here's my go at it. As far as I know this is complete, I'm sure I forgot some diesel powertrains though, since I'm an American and they aren't sold here.
t = hatchback
T = wagon/Touring (not put on actual car)
c = coupe or convertible - this depends on where it is placed. On E36 models a convertible is a 325ic, with "s" denoting a coupe. On E46 models a convertible is a 325cic, although only "325ci" appears on the car itself.
s = sport on E30s or certain older 5-series models, coupe on E36, not used presently
A = automatic. used on dealer invoices and not on actual car.
d = diesel powertrain
td = turbodiesel powertrain
i = fuel injected powertrain
CSi = sports coupe. not currently used
x = all-wheel drive
M = Motorsport division; prefix rather than suffix. Motorsport versions of vehicles don't carry engine notation but rather just the series number, such as M3 or M5.
1-series: sporty, small hatchback, 4 doors, not available in US.
Powertrains: 1.6i, 1.8i, 1.8d, 2.0i, 2.0d (inline fours)
3-series: BMW's mainstay - 2 or 4 door, available in sedan (i), coupe (ci or is), hatchback (ti, E36 only in US), wagon (iT) and convertible (cic). Some E30 and E46 models have all-wheel drive (xi or ix)
Powertrains: 1.8i (also 1.9), 2.0i, 2.0d, M2.3i, M2.5i Evo (inline fours), 2.3i (also 2.5), 2.5i, 2.5d, 2.8i, 3.0i, 3.0d, M3.0i, M3.2i (inline sixes)
5-series: BMW's mid-size executive sedan. 4 door sedan (i), available as wagon (iT) and newer models can have all-wheel drive (ix).
Powertrains: 1.8i, 2.0i, (inline fours) 2.3d, 2.3td, 2.5i (also 2.3), 2.8i, 3.0i,
3.0d, 3.3i, 3.5i, M3.5i (inline sixes), 4.0i, 4.5i, M5.0i (V-8s), M5.0i (V-10)
6-series: BMW's luxury sports coupe. 2-door coupe (ci) or convertible (cic).
Powertrains: 2.8, 3.0i, 3.3i, 3.5i, M3.5i (inline six), 4.5i (V-8), M5.0i (V-10)
7-series: BMW's large luxury sedan. 4-door sedan in regular (i) or extended wheelbase (iL, Li).
Powertrains: 2.8i, 3.0i, 3.3i, 3.5i (inline sixes), 4.0i, 4.5i, 5.0i (V-8s), 5.0i,
8-series: BMW's large luxury sports coupe, based on the 7-series. No longer in production. 2-door coupe (i, later ci) or high-performance (CSi)
Powertrains: 4.0i (V-8), 5.0i, M5.0i (actually 5.6) (V-12s)
*The M version of the 8-series was called the 850CSi, as an M8 version was being developed but was never released.
X3: BMW's smaller sports utility vehicle. 4-door.
Powertrains: 2.5i, 3.0i
X5: BMW's larger sports utility vehicle. 4-door.
Powertrains: 3.0i (inline six), 4.4i, 4.6i (called 4.6is), 4.8i (called 4.8is) (V-8s)
Z3: BMW's E36 era sports roadster. 2-door coupe or convertible.
Powertrains: 1.8i (1.9, inline four), 2.3i, 2.5i, 2.8i, 3.0i, M3.2i (inline sixes)
Z4: BMW's current sports roadster. 2-door convertible, coupe coming soon.
Powertrains: 2.5i, 3.0i (inline sixes). Possibly M3.2i soon.
Thus, for the numbered series, the model number is the series number followed by the engine size and any suffixes. Some suffixes are used on invoices and ads and don't appear on the car - for example, an automatic 325 convertible would be a 325cicA, but the car bears a 325ci nameplate.
I didn't include any far older models (for example, 1600, 2002, Bavaria, etc) as they do not conform to this system at all.
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Member of the "I haven't passed a cop at 115 mph or drifted on a neighborhood street to impress a girl because I'm not a fucking idiot" club
Last edited by 24valve; 09-19-2005 at 06:53 PM.