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I have been unable to find an answer for this. The last spec I seem to find that mentions backward compatibility is 2.1.

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They are backward compatible. But - since each version brings new functionalities with it, only the basic function set is backward compatible all the way, see the table for more detail. In addition to that 2 devices wanting to communicate using bluetooth have to support the same profile(s), the full piece that i copy/pasted from here.

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That's exactly what I needed, thank you! –  Matthew Apr 26 '13 at 19:59
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I have a big doubt about the honesty of this table. I tested two smartphones, one in BT3, the other in BT4 , with 3 cars (old> = 10 years). The BT3 works perfectly on 3 cars. The BT4 did not work on 3 cars. But it may be a problem due to Android .. –  palomar Jul 28 '14 at 7:10
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This is because the old cars are probably Bluetooth 3 single mode and it is not compatible with Bluetooth 4 single mode. You need to test Bluetooth 4 dual mode. –  qub1n Nov 2 '14 at 17:55

protected by Community Oct 8 '14 at 20:47

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