It "could" have contributed. Well made bio should be usable in any car just like pump diesel.
But I think in the winter it probably is still a bit thicker than pump diesel, meaning your injectors may not "mist" aswell which could lead to issues. Another thing is generally you need to run a little more advance with bio/veg. If you aren't it is running a little too retarded which I believe leads to higher EGT's?
Are you sure your glowplugs are not getting some kind of voltage after the initial "glow"?
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