just ran into this....
That guy is a bit of a dolt: advising using full synthetic is not going to help with fuel in oil dilution.
It is physics...when you mix a 20 unit lubricant with 0 at half/half you will end up with a 10 unit lubricant (if they mix uniformly) whether it is dyno or synthetic oil you started with.
The only thing you can do is change your oil more often 3000 or less miles .. (to get rid of the contaminated oil) and if it is that often just buy dyno oil as they do not chemically break down yet for such low miles.
2018 equinox 1.6l Diesel LT, Hecho en Mexico, julio 2017