You can see my last results here: 2003 Subaru WRX 2.0t, 7,247mi Mobil1 5w30 I'm thinking about trying another oil besides M1, namely RedLine or Amsoil. But I'm having a hard time justifying paying more than twice as much for those oils vs M1, especially when M1 is obviously working very well. If I were to try RedLine, I would use their 5w30, if Amsoil, I would have to choose between their S2K, XL-7500 and SAE series. Any convicing anyone can do either way would be interesting. Any thoughts?