BOMBAY'S rationing department and the crime branch are cracking down on the latest brand of highway robbers—the petrol adulterators. Over a month ago, 16 oil tankers were raided and 17 people picked up for filling them up with spurious petrol. In the past eight months, 131 oil tankers have been seized from Kalamboli, Talora, Turbhe and other New Bombay areas. Of these, 19 were bridging tankers headed for Andhra Pradesh, Karnataka and Gujarat. Part of the oil was also meant for Aura-ngabad, Jalgaon and Nagpur in Maharashtra.