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  1. 5W-20 or 5W-30?

    2019 GT PP1 Purchased in 2020. I run Valvoline Full Synthetic 5W-20. I changed oil to Valvoline Full Synthetic 5W-30 to run about 20 laps at Hallett Motor Racing Circuit near Tulsa during the 2021 Mid America Ford and Shelby meet. (Per owners manual to "Track Car") I did NOT change back to...


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