-23c cold start - 2011 Saab 9-5 2.0 TiD4

Car has been standing for two days with temperatures as low as -27c and as high as -19c.
Slightly weak 100Ah battery. 2 year old OEM glowplugs.
Filled with standard Norwegian diesel without any special additives.
Running 5-W40 oil with the GM-LL-B-025 specification and OEM oil filter.