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I have no idea if mine is a direct injection or not (Opel Astra 1998 with something about ECO printed in bold letters on the engine) but it has noticeable difficulties starting at -10C which would be +14F.
Before the Opel we had a diesel Mercedes (an charming old heap of rust from 1985), it was a pain starting already at -5C/23F
On the other hand I have seen the newer diesel BMWs start at any temperature without a heater, that's must be the ones you're talking about.
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