Here's a different idea. Take it out, warm it up, and drive it like hell for a 100 miles or so. As in extended rpm in the 2.5k range or so. Return home, and add your new quart of go-juice from Lucas.
The beast holds 15 quarts but there is about a 3quart margin on that dipstick last I checked -- surely you can blow off a quart or so?
And if seemed like you added more than you blew off? Then just do it again in a couple of weeks. Cost is one more quart of go-juice and another 10 gallons of diesel....
Or... wait until the next oil change interval (which incidentally, could be tomorrow if you catch the oil into a clean can) and then indeed put that Fumoto valve on...