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it doesnt have to have a DEXOS label on it. dexos spec is the minimum spec. basically any full synthetic exceeds the dexos rating. Amsoil is much better then any other full synthetic out there. your warranty is fine with Amsoil and even if GM tried to void it for having Amsoil in it. Amsoil will pay for your repairs then take GM to court. GM knows that so they wont void it. The signature series is great oil.
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real ZL1 wheels and brakes, 285/305 Michelin Pilot Super Sports, Pray ported Intake manifold, Soler Throttle Body, Rotofab intake, EFI Tuning Flex fuel kit, full American Racing Headers Exhaust, 1 7/8" w/ cats H pipe and mufflers. Full 1LE suspension, with BMR adjustable sway bars and links, GM aluminum cradle bushings, Hurst shifter with lighter reverse spring, TWM shifter knob, Tick level 1 transmission. I should have bought a ZL1
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