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Jose,
I think you forgot to tell us what YEAR and MODEL series of Skymaster you're referring to.
The POH for our 1977 Pressurized model has this to say concerning capacity of engine sumps:
"Do not operate on less than 6-quarts for each engine. To minimize loss of oil through breather, fill to 7-quart level for normal flights of less than 3-hours. For extended flights, fill to 8-quarts."
SkyKing
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