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  1. a_tack

    6.4 and MS-12633 oil

    As far as I can find only 4 oils meet the MS-12633 spec: Pennzoil Ultra Platinum, Mopar, Amsoil, and Redline. Seeing as those are not readily available in most areas on store shelves in a 0w-40, have any of you experienced any adverse effects from using Castrol Edge or Mobil1 0w-40? I’ve...
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