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https://oil-glup.ru/threads/ultron-10w-40-100-diehsterovaja-sintetika-iz-1980-x.115/#post-1601
An old magazine ad contrasts standard fuel-saving methods with Ultron E-II diester synthetic motor oil. A line drawing at the top shows a driver pushing a car, set beside four conventional quart cans of Mobil 1, Pennzoil PZL, Quaker State Sterling, and Shell Fire & Ice, with the headline One Way To Reduce Fuel Consumption. Below them, a large can of Ultron E-II sits centrally as the ultimate fix. The text at the bottom argues that pure diester synthetics beat partial blends by handling extreme temperatures from -50 °F to 480 °F while extending drain intervals up to 25000 miles.