Currently running Quaker State Horse Power full synth. If I'm not using that, I normally run Castrol GTX.
My previous preference for my old Pontiac Sunbird was Rotella 15W40. Started good in the winter, and pulled out an incredible 36 mpg highway pounding on it during the summer.
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Current mods: AEM Bruteforce CAI, Magnaflow SI/DO, Gryphon-87 & 93 tunes, Harley head lamps, tinted windows, lower grille filler, and FX2 lower valance.
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