would it do anthing to my car if i just changed to royal purp.

 

royal purple is a true pao base fully synthetic oil, like mobil 1. castrol syntec is NOT a true pao base oil they use dino base in it that is highly purified so they are able to put the synthetic name on the bottle, but it still contains the ingredients that all dino oils have that creates sludge. sludge will not form in a pao base oil and just in general royal purple is a world class oil. you will notice more horsepower, better gas mileage, and drastically reduced engine wear