The object of a deep oil pan,ls to keep the oil below the crank.Not to hold more oil.

The pan manufacturers should just say how deep the pan is,not a capacity.

If your stock pan holds 5 qts plus one for the filter,I would run six quarts in the pan and one in the filter. Run the engine and mark the dipstick.

Dennis Jokela
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I started out with nothing,and I still have most of it.