Mouse Milk
Mouse Milk Oil can be found on page 54 of Chief Aircraft 2003 catalog, volume 21.
It does sound like the waste gate is not closing all the way.
Fred N358

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N358 1967 337B Normally Aspirated,
KX155, Mod "C", Cessna Auto Pilot 400, 4 Seats, 3400 TT on Airframe
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