I'm the second owner of a 1993 Acura Integra with 215 000 miles on it. It had a diet of QS dino until I bought it at 100 000 miles. I switched QS Synt (100%. Had to change the Valve cover gasket last week and to my surprise it was very clean.No sludge to be seen. I use Mobil 1 in my mustang but...