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I appreciate the replies. As an old drag racer who ran Valvoline 20W-50 in my nitroused 347, i always like a little heavier oil. That just solidifies my thoughts as well. Thanks

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...

Bought this 66 from my parents in 78. My first car. Drove it, modified it, raced it, literally lived life with it. Sold it after 42 years. Have owned 3 DD Mustangs during that time as well. I wanted A/C, safety features and to start from scratch engineering a faster/quicker Stang. The day after...