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E84. All X1's of the current generation share that chassis code, regardless of the engine/drivetrain fitted. That's why you will see people refer to things like "E84 35i xDrive" or "E84 28i sDrive" to designate chassis, engine and drivetrain.
It's not really so much of an issue for the X1 where the model name has only been in existence for a short period of time and only covers one body type (SUV/SAV), but for vehicles like the 3 or 5 series that have been through a number of chassis changes and have various body styles (sedan, coupe, wagon, convertible etc) it's more useful.
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