There is a sharing from man10681 in Tufoil Review on the use of a branded synthetic plus Tufoil posted Oct 28.
Tufoil will enhance the quality of any oil, be it mineral or synthetic. The overriding important thing is still the coefficient of friction. If this figure is high, your engine suffers.An oil should not be judged by its type, i.e synthetic, semi-syn or mineral.
Most people go about in a trial and error way in search of the best lubricant. This practice is unavoidable because little information is available and nobody will say their lubricant is not so good. We suppose at the end of the day you are the best judge because you drive that car.You will want something that works for you regardless of whether it is a synthetic or mineral oil.