If you are having trouble at that temperature with 15w40 in the crankcase, I would second the remark about your starter and/or the battery, but also ask when the valves were last adjusted.

I use 5w40 Rotella but around here it gets COLD in the winter and 15w40 is fudge in those conditions.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22