About 85 percent tankers are unfit for carrying oil, said the Oil and Gas Regulatory Authority (OGRA) said on Thursday.
In its report, the OGRA said Ahmedpur East incident occurred mainly because the tanker carrying oil was unfit.
The OGRA recommended the government to formulate a strong policy in this regard.
Meanwhile, the death toll from oil tanker blaze near Bahawalpur rose to 212 as four more injured lost their lives in Multan and Lahore hospitals.
As many as 42 people in Multan and 23 in Lahore have succumbed to injuries so far.
Motorway Police Spokesman Imran Shah has said that a government inquiry into the incident had found at least five police officials guilty of hiding information.
The tanker overturned on the main highway from Karachi to Lahore, while carrying some 40,000 litres of fuel. It exploded minutes later as crowds from a nearby village gathered to scavenge for fuel, despite warnings by the driver as well as the motorway police to stay away. The accident took place in Ahmedpur East.
