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05-02-2009, 09:56 AM
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Synthetic oil rating
Found some Mobil 1 high mileage full synthetic 10w40 with an API rating
SL/CF and one they call 4 cycle racing oil full synthetic 10w40 rating SH/CF would either be a good oil for a circle track flat tappet engine. 
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05-02-2009, 10:20 AM
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my opinion for circle track would be a straight weight conventional oil.
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05-03-2009, 07:02 AM
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SH rating will have the zinc needed for a flat tappet cam.
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05-03-2009, 09:43 AM
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Thanks for the info.
Come to find out My brother is an Amsoil dealer and I didn't even know it. I rememberd that he has used Amsoil for a long time now so I called him and one thing led to another, looks like I ill be using Amsoil racing oil this race season. I will post my thoughts and seat of the pants results. Thanks for all the good info guys.
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