A synthetic oil change can cost over twice as much as conventional oil...but is it worth it beyond its obvious better performance characteristics? This is not exactly a straight yes or no answer to go along with this question as there are several variables to consider, but in general, most experts would agree that synthetic is (for now) the lesser of the two evils.
WHO SHOULD USE HIGH-MILEAGE OIL? When is the time right to start running a high-mileage oil? The folks at Valvoline recommend you make the switch at 75,000 miles. Zhang said “we use 75,000 as a typical reminder,” though you can certainly run MaxLife or a similar product beyond that, or even before.