You can buy the same grade oil which you use or this one
MoS2 Antifriction Motoroil 10 W-40
- suitable for petrol and diesel engines with and without exhaust-gas turbocharging and with and without charge air cooling
- rapid oil delivery at low temperatures, good cold-start behaviour
- very high protection against wear, limp-home properties due to MoS2
- good ageing and viscosity stability
- outstanding engine cleanliness
- tested for catalytic converter compatibility
With this oil you wont even have to use Ceratac.
I know the shop which is near Tooba Masjid (Gol Masjid) DHA, who sells these oils and is reliable.