Robot_trainer
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  • Yes, it does apply to the 2013-2014 GT500. I am 100% XL these days, as the formulation is better overall than AMO.
    Very interesting point. Would be nice to use amsoil again and by the way I did notice the 5W50 was like snot when I poured it out of the bottle. Whats your opinion on the 5W40 Redline since it is an SN oil?
    The higher ZDDP content in Amsoil AMO 10W-40 will not harm the cats anymore than low ZDDP found in Motorcraft 5W-50. AMO has a very low NOACK (evaporation) about 6%. Motorcraft is ~11%, more than 50% higher. More evaporation means more additive is lost to the intake, and eventually the cats. AMO doesn't have 50% more ZDDP than Motorcraft. See where I am going with this....
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