I'm not a tribologist and dont want to even pretend like I am one, but I have worked with a few over the years. One of the guys in aviation tech school, twenty or so years back, was talking about fuel dilution and for whatever reason what he said stuck with me..... He would say "If you smell fuel in the oil, get the oil out of there. Even if you could evaporate all the components of the fuel out of the oil, which you'll never be able to do in the confines of your average engine, whatever VII's and PPD's and other additives were used when the oil was formulated have been chemically altered, so add all the heat you want, without re-refining that oil and starting over, you wont get the original oil formulation back to where it was before the gas was in there. An Italian tuneup wont fix this issue. Get it out of there and replace it with new oil". Right or wrong, thats the advice I was given and what I've followed regarding fuel dilution. He gave us some lab reports to back this up and I know I saved them in a box somewhere, I really hope I can find those one of these days...
I'm just a dude on the internet, so take that with a grain of salt. I dont have the proper credentials to yay or nay what he said.