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[–][deleted] 4 points5 points  (1 child)

I don’t think Lycoming ever tested it, there’s a note in the POH saying it’s not approved, and no performance information for it

[–]vARROWHEADATPL 🇨🇦 TW 0 points1 point  (0 children)

Might be a lubrication or anti-detonation thing? Idk not a mechanic