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Message: <blockquote data-quote="RedZ4" data-source="post: 145690" data-attributes="member: 1117">I've used Mobil 1 0W 40 but that is for an bi-turbo Audi. Its actually pretty good until I tried a better oil, Amsoil 2000. I heard the mobil 1 isn't fully synthetic like Amsoil 2000. For track days, I've noticed the oil temperatures didn't increase as much as the Mobil 1. As for fuel efficiency, I've never noticed any significant changes. But both oils are much better than other so called fully synthetic oils that I've used (i.e.Castrol ) But this is my opinion an d on a different car.Yes these oils are much cheaper in the U.S. than here. I had to use 7 quarts for my S4. And from what you've quoted in the prices here, I don't think I'll spend that sort of money to get oils. Have to find a cheaper alternative.</blockquote>