This subject is like the tire threads we see - there is no correct answer
that everyone agrees on.  Here is my two cents.

First off, I live in sunny / cloudy British Columbia where in the winter we
hit -30C at times with the average between -10C and -20C.  In the summer
+20C to +25C is the average with temps going above +30C a few days.  I use
Castrol 15W40 that I buy in the 20L buckets as Costco with Bosch Filters.  I
change my oil every 5000KM or if I don't drive that vehicle as much at the
change of every season.  Some people go on about how Synthetic is better, I
think they are right, but only to a fine point.  Your oil still gets dirty -
dino or synthetic.  The Castrol oil at Costco meets all of VW specs.  The
only real exception to this for me is when we take a vehicle on a long road
trip in the summer where I will put in thicker 20W50.

David Marshall - Volkswagen Enthusiast Quesnel, British Columbia, Canada

78 VW Rabbit [1.8L]
84 VW Westfalia with I4 [For Sale]
84 German Army VW Double Cab [For Sale]
87 Audi 5000 Quattro
87 VW Fox Sedan
88 VW Syncro Double Cab

David's Volkswagen Home Page
http://www.volkswagen.org <http://www.volkswagen.org>

Fast Forward Automotive Inc.
http://www.fastforward.ca <http://www.fastforward.ca>