That's what we get for having modified cars. On two of my Panteras they have what's called 10 quart pans, yet when I change oil & filter I typically put in 9 or just over and I get all the way to the W on Warrant. Talking to venders they say if it really has a 10 quart pan then don't sweat over it, just fill to under 10 and note where the mark is. Looking at prior receipts I see the prior owner has always put in 9 - 9.5 in mine too when in for service. When emptying just be sure you adjusted the car even enough so you are sure most oil has exited. I can squeeze about 1 more quart out of mine when I'm lowering the car to be sure the pan is level. FYI my stick is the proper length too.
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