d = diesel
i = fuel-injected
x = all wheel drive (xDrive)
L = long wheel base
C = coupe
T = touring (wagon/estate)
t = hatchback
g = biogas
s = sport package (Sports seats in the front, spoiler on the rear, improved gearbox, custom rims)
si= sports injection (the new range of x5, x3 and z4 engines)
e = eta (essentially "economy" in English)
es = eta spo