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Look on the website bobistheoilguy.com. There is a member AEHaas, who has several exotic cars. Ferraris mostly. He runs 0w-20 in them. I would recommend you try Redline 10w-30. Yes it's expensive but you'll only need to change it once every 2 years maybe.
If you can write a custom tune, you should lean it way out. Forget 14:1, try 18. I would imagine the robust V8 can handle lean burn as the large metal volume and overbuilt cooling system can handle the heat.
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