I first used Pertua oil additive back in 1995 cuz my Dad got can for free. Our 1989 Nissan Sentra 1.3 SLX sudden sprang to life. I also started using it in our 1994 Toyota Corolla GLi when it was out of warranty up to the present. I always try to convince myself that its just a placebo effect but it really seems to work. Gas mileage objectively increases, better acceleration, etc. I once had an oil change in the car dealer without pertua & it actually felt heavy right after a new oil change! I the change is more noticeable with old cars. My 94 Corolla can outsprint my 03 CRV without really trying. Seeing is believing. I was able to buy a can of the additive for P 450 at Robinson's Handyman in Festival Mall Alabang. I bought a can for P 300 in a car parts dealer along the SLEX east service road near Caltex Merville.