It was the OMC laboratories’ failure to provide the required result that raised suspicion; the samples were then sent to NABL-accredited and ISO-certified laboratories, says Rizwan Arshad. Karnataka's minister Rizwan Arshad has accused oil marketing companies of exceeding the legal ethanol blending limit in petrol. He claims that tested samples showed blending levels as high as. If ethanol blending is automated, how can excess levels be limited to a few outlets?