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>