NEW DELHI, June 6 -- The Centre has mandated standard pack sizes for major edible oils and given manufacturers, packers and importers three months to comply, rolling back a proliferation of odd-sized packs that industry and consumer groups say made price comparisons difficult and confused buyers.

In an advisory issued late Friday, the Department of Consumer Affairs (DoCA) amended the standard operating procedure (SoP) governing the determination of net quantity and standard pack sizes for edible oils and fats under the legal metrology framework.

Under the revised rules, standard pack sizes have been prescribed for major edible oils, including palm oil, palmolein, soybean oil, sunflower oil, mustard/rapeseed oil, groundnut oil, sesame oi...