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AoA on 10W-30 vs. 10W-40

According to a chart in my '89 100q owners manual (p.98), the climate 
temperature range is the SAME for 10W-30 and 10W-40 engine oil, 
shown as approx. -5F/-20C up to only 60F/15C.  Questions:  

1. Are these numbers right?
2. Why doesn't the range for 10W-40 go HIGHER than for 10W-30?
3. If these nubers aren't right, why does Audi publish wrong info?

Doran Howitt <dhowitt@iddis.com>