https://drivenracingoil.com/rt-5996-catalog.htmlDownload the catalog and find their chart on viscosity recommendations. I attached a photo as well. The section on viscosity recommendation also explains about running alcohol and how to choose a viscosity right for your engine.
I am not anywhere near as smart as they are but the best way to deal with fuel dilution on a E85 or Alky setup is #1 work on your tune so it doesn't milk the oil, #2 run the proper crankcase evacuation AKA a vac pump so what moisture is created is removed and #3 run your engine hot enough to help with evaporation of the moisture so the pump can remove it.
Nothing good ever comes from diluted oil.
