I just finished reading the article and they did state that the due to the additive packages, you should run the oil/gas ratio at the one recommended by the oil MFG. Running too much or too few additives will cause problems and changes in your results. As we know the additives increase lubrication and decrease deposits. It seems that the caster didn't have any additives so they were just testing the lubrication, power and temperature benefits of caster. If we use another base stock then the additive package is what will determine the mix ratio of the oil!