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Castrol products are still marketed under the red, white and green colour scheme that dates from the launch of Castrol motor oil in 1909. Advertisements for Castrol oil historically featured the slogan "Castrol – liquid engineering". This was more recently refreshed and reintroduced as "It's more than just oil. It's liquid engineering." [27] [28]
By the mid-1980s, recommended viscosities had moved down to 5W-30, primarily to improve fuel efficiency. A typical modern application would be Honda motor's use of 5W-20 (and in their newest vehicles, 0W-20) viscosity oil for 12,000 kilometres (7,500 mi).
The clear cut definition of light and heavy crude varies because the classification is based more on practical grounds than theoretical. The New York Mercantile Exchange (NYMEX) defines light crude oil for domestic U.S. oil as having an API gravity between 37° API (840 kg/m 3) and 42° API (816 kg/m 3), while it defines light crude oil for non-U.S. oil as being between 32° API (865 kg/m 3 ...
In 1955, South Penn Oil acquired complete ownership of Pennzoil Co. [1] In 1963, South Penn Oil merged with Zapata Petroleum and Stetco Petroleum to form a new "Pennzoil Company", headquartered in Houston and appointing Hugh Liedtke as president. By 1965 Pennzoil marketed its petroleum products worldwide. [1]
The resources of heavy oil in the world are more than twice those of conventional light crude oil. In October 2009, the United States Geological Survey updated the Orinoco deposits (Venezuela) recoverable value to 513 billion barrels (8.16 × 10 10 m 3 ), [ 16 ] making this area one of the world's largest recoverable oil deposits.
Tight oil formations include the Bakken Shale, the Niobrara Formation, Barnett Shale, and the Eagle Ford Shale in the United States, R'Mah Formation in Syria, Sargelu Formation in the northern Persian Gulf region, Athel Formation in Oman, Bazhenov Formation and Achimov Formation of West Siberia in Russia, Arckaringa Basin in Australia, Chicontepec Formation in Mexico, [1] and the Vaca Muerta ...