Originally Posted By: AuthorEditor
Audi Junkie's chart always interests me because I can definitely hear and feel the difference between a 15w and a 5W when temperatures get below freezing, yet if you read the chart the 15W should be OK down to something like 15 degrees. Here in upstate NY I don't want anything heavier than 5W in my cars for the winter. Of course the T6 is a 5W-40, so I think you should be OK as long as the 40 part is fine for your engine.
Our winters are cold mainly due to windchill, but absolute temps tend to remain within the 10W30 range (although they cut it very closely). Near and below freezing I still prefer a 5W30, and even though a 10W30 meets our temperature range, the 5W30 will definitely lubricate faster in our winter, and reduce cold start wear.
I'd even switch to a 0W30 if they weren't so hard to find here (maybe by next winter I'll have found it somewhere).
-Spyder