I have been using Delvac 1 in my motorcycle for some time but they have stopped stocking it at Walmart. I noticed Rotella T SB 0W-40 at CTC and the jug stated "100% synthetic*". The astrisk caught my eye. I figured SB meant synthetic blend, so I called Shell Canada and was told that yes, the 0W-40 and 5W-40 are 100% synthetic and the 10W-40, 5W-30 and 0W-30 are indeed blends. Does anyone know the scoop on this topic?