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Wanted to add,5W oils have been around since the 70s. Mobil 1's first oil was 5W20 which came out in 1973. From Mobil's site: 1973 Mobil 1™ synthetic engine oil is released in Europe, becoming an instant hit among car enthusiasts and owners of expensive high-performance cars. Formulation changes are made to test a fuel-saving 5W-20 grade in the USA, which becomes Mobil 1 synthetic engine oil.
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