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It may be the glow plugs that do not heat enough. Under 8°C mine are switched longer and in this case I switch them 2 to 3 times before starting the engine.
Does your glow plug light is lightening longer than during a hot weather ?
A 10w oil should be enough as it should work for -17°C (0°F).
I have found that high grade diesel make the start easier, but I have only -3 to 3°C (27 to 36°F) temperatures.
My battery is new. May be yours is telling you that it's too tired for such a cold weather.
Denis.
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