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Old 12-30-2008, 07:30 AM   #5 (permalink)
groar
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Join Date: Jun 2008
Location: Toulouse, France
Posts: 595

scenic - '01 renault scenic
90 day: 43.09 mpg (US)

megane - '97 renault megane classic
Diesel
90 day: 72.53 mpg (US)

dennisius - '06 Toyota Prius
Team Toyota
90 day: 69.27 mpg (US)
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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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Best Mégane tank: 1268.9mi @ 77.847 MPG(US)
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