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About the only thing she can say bad about it(and any diesel really) is they don't like to start when its cold. She usually has it plugged in at her house on cold nights, but it left her stranded at work when it was like -5 degrees in Ohio a couple of weeks ago. She was funny, "Oh I let my poor car freeze to death, it was 0 degrees all day and that wind just whips through that parking garage."
Thankfully I (knock on wood) don't share this experience. My 335d started up just fine the other week after sitting outside for 12+ hours in -17F ambient/-39F windchill. Took just under a second for the glowplug to warm up, then ran really rough for the first few seconds, but it fired right away.