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Run you car to 15% and then you can put in whatever brand you wish.
I have run Mobil 1, Amsoil, and Royal Purple without problems.
Claims of like 5 H.P. increases with synthetic I question, but the increased protection offered by synthetic under extreme heat conditions make it worth the extra $$.
Look for Mobil 1 on sale at Canadian Tire or Wal-mart. It happens all the time.
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