I believe I'm sold on the Valvoline Blue Syn 4w40
Started out with Devac 15w40 then went to the Valv 15w40 for one oil change before going to the syn.
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2000 F-250 SCLB 2wd 7.3 auto PHP stock-65t-80dd-120race-high idle-no start 4"tb exh, wicked wheel, 3 guages, AIS, coolant filt,
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