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Mobil1 or Amsoil are top of the line synthetic motor oils. I use 5W30 Amsoil with the Amsoil oil filter. It's a bit high at $50 for all of that, but the oil is good for much longer than conv. oil..7500 miles, or 1 year I believe. The filter is very important as well, which is why I use the Amsoil filter.
i dont care how long they "Say" is should or will last... but IMO i will always change my synthetic oil every 3000 but thats just me.