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I have tried Amsoil once and didn't care for it much for the price at the time. Until about 2 years ago I used Mobil 1, with no complaints. I tried Royal Purple and was very pleased with it. I now use it in both my Accord and my NSX(both are tracked). I thought I was crazy, but my car seems to run noticably smoother with the Royal Purple. My wife had my Accord at her work one day and bought the oil and did an oil change and told me that the car does run smoother, especially after an oil change. I have been curious to try Eneos but is even more expensive than the Royal Purple.