BMW logo with "The Ultimate Driving Machine" tagline.
BMW's numbering system is fairly simple. Numbers, usually odd numbers, indicate the relative size and expense of cars. Everyone has heard of BMW's 3-series, 5-series and 7 series cars. In Europe, BMW sells the bargain-priced 1-series.
The next two digits indicate engine size. The BMW 325i has a 2.5 liter engine. The BMW 330i has a 3.0 liter engine.
The letter i is a holdover from times when fuel injection was something to brag about rather than something you would find in even run-of-the-mill economy cars. In Europe, where BMW sells diesel-powered cars, one can also see the 325d on the road.
Sometimes two letters appear after the number, as in the 325Ci and 325Xi. The first letter indicates a special type, as with the two-door 325Ci coupe or the all-wheel drive 325Xi.
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