I left my 300SD home in the unheated garage today, with temps reaching down to -26, and getting all the way up to -19 Celcius for an hour or so.
Hate the mileage I get on my Grand Cherokee, so I thought I'd check on how my Mercedes would start without being plugged in all day (trust me, the unheated garage can't be a big plus for her).
Anyway, I went out at around -24, and tried to start it - successfully. It did stall after a few seconds without the pedal pushed, but once I had it started and gave it one push of diesel, she kept going just a like the trooper she really is.
Guess what I'm driving tomorrow.....
Just goes to show that kept in good condition, these machines will run well for you. The PO replaced the plugs and battery just before I bought it.