Bmw 640d M coupe ‘11, Bmw X3 2.0d xdrive M ‘19
You are right about not lowering/rise manually. But they included air suspension in the rear, see here on the 6th bullet “Lift-related dampers and rear-axle air suspension come as standard.”i dont believe they do - asked my dealler and it is only a stiffness option not the lower/rise one
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this is probably the same tech as the 5 series f11 touring introduced back in 2011, to be able to be always leveled in heavy load. Which is something the i4 is always due to the batteries weight.
the stiffness option your dealer mentioned should be related to the adaptive dampers. I have it also on my 6 series, you can select sport, comfort, comfort+, although no air suspension in mine