For the past 12 years or so I have rum Amsoil in all of my vehicles. 2 WRXs and a Matrix I'm currently selling. Based on the documentation from my Amsoil rep I've always changed once per year or at 15k mile intervals. These oil change intervals do not void any new manufacturers warranties as long as their kept to schedule. I was super skeptical so on my first oil change with 14500 miles I had a basic Blackstone teat performed. The result surprised me the overall condition of the oil was better than new conventional oil. That's what sold me. I will change the factory oil at 5k and do the Amsoil with their filter (WIX) unless I see in the manual that they recommend doing the first oil change earlier.
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