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In 1998, Mobil sued Castrol over the discovery that Castrol was processing conventional oil and calling it synthetic. At the time, Mobil 1 was still created using a true synthetic basestock, which is more expensive. Mobil lost the lawsuit, and, as a result, the "new" definition of 'synthetic oil' became much looser. In order to stay competitive, Mobil needed to downgrade their process to the more affordable process. The result is a hydrocracked, hydroisomerized conventional oil. Lubes N' Greases magazine has reported shortcomings in the ability to pass the tests that the original Mobil 1 formula was able to.
Commercial automotive and motorcycles partnershipsEdit
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Mobil 1 is an official recommended motor oil of Porsche, Toyota, Lexus, Daihatsu, Hino, Nissan, Chevrolet (mostly Corvette), Cadillac, Buick, Holden, Bentley, Mercedes-Benz (before 2015, predominantly Mercedes-AMG models, currently switched to Petronas from 2016) and Perodua for automobiles, and also Honda for both automobiles and motorcycles.
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Formula One team Williams had Mobil sponsorship from 1978 to 1988. In 1987 it switched to Benetton, until 1992. Team Lotus also used Mobil 1 in 1994. From 1995 until 2016, it sponsored McLaren. Mobil 1 was also lubricants supplier for Toyota F1 team in 2002 until 2009, Brawn GP in 2009 and also Force India in 2009 until 2013. In 2017, Mobil 1 switched to Red Bull Racing  and its sister team, Scuderia Toro Rosso.
NASCAR Cup Series driver Rusty Wallace was sponsored by Mobil from 1987. In 1991, he carried his sponsorship to Penske Racing. Jeremy Mayfield had Mobil as the primary sponsorship in 1998, and later Ryan Newman and Sam Hornish Jr. took it as well. Penske's IndyCar operations also had Mobil sponsorship from 1991, until the deal was ended after the 2010 season. Since 2011, Tony Stewart has carried the Mobil 1 sponsorship in his No.14 Stewart-Haas Racing car. Toyota Racing Development-supported NASCAR teams also use Mobil oil. They currently sponsor all four of the Stewart-Haas Racing Ford's of Clint Bowyer, Kevin Harvick, Daniel Suárez and Aric Almirola.
Mobil was a lubricants supplier of DTM team Mercedes-AMG from 1995 until 2010. It supports Porsche and Corvette sports car programs as lubricants provider since 1996. The Bentley Continental GT3 factory cars are also sponsored by Mobil 1 since 2013.
Mobil, from 1985 to 1993, was title sponsor of Peter Brock's Holden Dealer Team and Advantage Racing that competed in the Australian Touring Car Championship and in the 1986 European Touring Car Championship. Brock from 1985 until his death in 2006, appeared in advertising for Mobil 1, including an international campaign that ran in the United States in 2000. Since 1994, Mobil has been a sponsor of Supercars team Walkinshaw Andretti United.
As well as sponsoring teams, the brand sponsored the German Grand Prix from 1987 to 2006 and the French Grand Prix from 1998 to 2004 . Since 2003, Mobil 1 has been the official sponsor of NASCAR and sponsors the Command Performance Award, which pays a monetary bonus to the highest-finishing Mobil 1 using team. Since 2002, it has been the title sponsor of the 12 Hours of Sebring. Since 2008, it has been the title sponsor of the Porsche Supercup.
In 2001, Mobil 1 became the primary jersey sponsor of French Ligue 1 football side Sochaux, which was founded and is owned by the Montbéliard-based Peugeot automobile manufacturers. Sochaux has alternated in recent seasons between wearing partner brands Esso and Mobil 1 across the chest of their jerseys, favoring the latter for their 2012-13 Ligue 1 campaign.
On the YouTube channel, "Project Farm", Mobil 1 Annual Protection 5W30 Ultimate Full Synthetic as well as 15 other oils were tested for bearing wear, cooked oil evaporation amounts, and subzero viscosity testing of the cooked and uncooked version of the oils. Mobil 1 Annual Protection 5W30 Ultimate Full Synthetic placed 12th overall.
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