[Vwdiesel] Oil question

[mikitka]

I know not another oil thread, just was wondering if I should move to a
10w-30 oil from the 15w-40 for the winter? The temp here can get down into
the teens F but not very often and not for long, maybe a weeks worth and
that is it. Mostly it gets into the 20's to 30's with highs anywhere from
the 30's to 50's. Heck one Feb it hit 70 F and it was on the one day out of
my life that I was at the ski slopes here in NC,(small 5,000 ft high hills)
and all the snow was melting.  

So far from my re-ring after the broken new ring circus the engine is doing
well and is not using much oil. It has around 6k on it now.
Nick