every heard about the term ''UN-LEADED FUEL ONLY'' ? there is a sticker on the fuel lid too.
if there is even 1 gram of lead it will not choke your catcon but will def make your engine knock crazy or worst case sieze it.
Attock refinery has the most purest octane values and the finest fuel in isb/rwp.
by law and by any laboratory, there must/will be no lead in the fuel you purchase from Attock.
by the way do you know that SHELL/PSO all buy fuel from attock refinery (that too a not with pure octane values so they can save extra and only attock on its company run pumps have the right fuel) ?