https://www.at4forum.com/threads/marvel-mystery-oil-to-use-or-not-to-use-in-brand-new-diesel.2096/
Marvel Mystery oil??? to use or not to use in brand new diesel?? | GMC AT4 Forum
2024 hd3500 duramax, does anyone have an opinion on putting marvel mystery oil in a brand new diesel to help fuel economy?? i have heard both some say use...
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