Most times oil gets milky with alcohol is becuase tune is too rich.
Old Fashioned if you can find it C I -4 Grade 15-40 Fleet or Diesel oils work very well for anything except blown. Blown you need heavier oils.
In Chevrom RPM Dello it is called MUlti-Grade. Avoid the LE or Low Emmision. Shell Totella T if you can still find the CI-4 classification oil. Careful Shell is printing the CJ-4 to look like CI-4. The difference is that the J is combining with the C at the bottom but at the top is separeted. I found this with a magnigying glass after buying a buch of oil and it jsut didn't look right on the API symbol. NAPA also has good Fleet Oils. Remember it has to specify as API CI-4.
Ed