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Mike,
Back to your original thoughts and idea...
I think you may have something here...
you know in the Porsche manual "Vehicles for Sport Purposes" it recommends for the 2.0L S engine to use SAE 20 and for racing use SAE 40....they did recommend using Valvoline Racing Motor Oil for the SAE 40
So that is 20-40.....more like your thought of 15-40
I think you have an interesting idea.
John
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John
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