(I hope I'm ALLOWED to post this picture...) Here is a link, just in case: http://pictureposter.audiworld.com/50038/oil_chart.jpg Here is the oil chart for my '96 Audi A4 with the 2.8 12v motor. As you can see, I can supposedly use these viscosities: Full Synthetic: 5W-30, 5W-40, 10W-30, 10-40 (I use M1 0W-40) Works for ambient temps from below -20F to above +95F. Dino Oil: 5W-50, 10W-50, 10W-60 Work practically for the same temp range as the full synthtics above. 15W-40, 15W-50, 20W-40, 20W-50 Work for ambient temps from -15F to above +95F. 5W-30, 5W-40, 10W-30, 10W-40 Are recommended only for temps under 60F. Now, we all talk about the fact that engines are designed to use a certain oil thickness, due to clearances. However,looking at the chart Audi provides for my car, I can use pretty much any viscosity, as long as the oil I use is within a certain ambient temperature range. Isn't that just a tad strange? Opinions, please!