I'd suck a quart out of there, its not good to run a diesel high on oil. Bad things can happen. Optimum spot is just below the max mark. Usually takes about 7 qts like was mentioned earlier. What I usually do is add 6.5-7, run it 2-3 mins, shut it down and wait a couple mins, take a reading, then add a teeny bit if its by the min mark. If its ok, I leave it and go. 
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