Monograde 85w140

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1,187
Location
Australia
I noticed the other day an 85w140 with a VI of 100 which made me ponder if this was indeed a SAE140 that just happened to meet the requirements of an 85w.Or maybe it was a multigrade with a very low VI. I have also noticed synthetic Mono 50 transmission oils with a VI up around 130 while 75w90s may only have a VI about the same. So what exactly is a Monograde these days? Something without VIIs or something that does not meet a w number?
 
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13,613
Location
Frisco, TX
Modern basestocks are getting so good that monogrades often qualify as multigrades. The president of Renewable Lube told me about this phenomena, and you even see it in Red Line products too (their race oils).
 
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