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Yep, I'm sure it will ruin it.
That's Ford, for instance, takes the exact same engine in the GT Mustang's and runs it on 5w-20, but in the Track Pack (now Performance Pack) cars they run 5w-50.
In the Subaru manual it even says thicker oil is appropriate for high performance use. Where he lives, he's never going to have to worry about the cold pour point of 10w-30.
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