Been using this brand of oil (Nis-Syn) since my last two PMS and this oil has done wonders to my '92 model sentra. It's fully synthetic and oil-seal friendly to high mileaged cars. The engine runs/idles smoothly as ever and my mileage increased from 8.5 to 10 kml/L on city driving. And according to the Casa S.A., it's proven safe for 10k oil change interval... which of course I'm afraid to follow - ehehehe (scary ).