I have the following viscosity chart and I can't remember where I got it. I was looking at some data sheets on some Mobil 1 oils and either that chart is wrong or I am reading it wrong. For Mobil 1 0w-40 cSt @ 40* C is 78.3 cSt @ 100* C is 14 According to my reading of the chart, this would be a 20-30 grade oil. For Mobil 1 Racing 4T cSt @ 40* C is 86 cSt @ 100* C is 13.8 According to my reading of the chart, this would be a 20-40 grade oil. So what am I doing wrong. I am probably showing my noob status here so go easy on me.