@minex. i got one from shell pump Jinnah Super Wala near Kabul Restaurant. Its Rs.150 per bottle. Just give it to the attendenat when u go for a tanky full. he will add it first and then fill up your car.
i felt considerable improvement in pick of car. after all i never went out to get a pressure check etc.
all these years.
the car still gives good avergage of arnd 18~20 while driving at an avg speed of 90km/hr. Drive mostly between chakalala and blue area