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My last truck was a 1996 Ford F150, I drove it for 8 years, 176,000 miles. the temp gauge had the word normal in the face of the gauge. The temp always ran on the "r" in normal. The last time I changed oil I change from Castrol GTX to Mobil 1. I imediately noticed that the temp was on the "n" and not the "r". That would be 5-10 degree temp drop from using the syn oil. If the lesser friction can lower the temp that much, there could be some hp gain.
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