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I have heard horror stories about this in the past but never seen it. This is a friends oil pan. He was running syn. Amsoil and had some injectors fail which causes vegi contamination into the crank case. He did't catch it before it turned to "play dough". I myself have had vegi oil contamination and this never occured but i was running regular Rotella oil, not a syn. Maybe that was the difference, not sure. Point is, keep an eye on the oil level and if you see it rise, you have a fuel/injector leak and you need to get it taken care of before this can happen.
So basically when i saw the 17 quarts, i wondered if i had overfilled on the previous oil change because i could not see or smell any fuel contamination. So i put 15 quarts of new oil in the truck and ran another 5k miles and monitored it. Same thing...17 quarts of oil when i changed it. Still no noticable poly of the oil or smell. So i went to the ford dealer and had them test for leaking injectors and the test showed nothing. At that point i was really confused because the ONLY thing it could be is fuel from leaking injectors to raise my crank case oil level. So the Tech told me to run another 5k miles and monitor...i did and the same thing happened and I went back to Ford and had them test again but this time i asked the tech to extend his test time from 10 minutes to maybe 20-30. The way they test is, they drain the oil, remove the fuel bowl lid and pour a die into the fuel. Then block off one bank (to test one side at a time) and they pressure up the fuel system and wait ten minutes while standing under the truck with a black light monitoring the oil that is still dripping from the drain plug hole. If you have a leak, you will see die come from the drain hole. So the first time he tested it, there was nothing that showed up in that 10 minutes...the next time he tested it he saw die in 17 minutes. A very slight leak but still a leak and it was all 8 injectors again. Once they see die at the pan, they lower the truck, remove the valve cover and look at each injector with the black light. Any die will be puddled next to the leaking injector on top of the head.
) that do not heat VO sufficiently can have such poor injector atomization that fuel 'washes' the cylinder walls increasing chances of ring failure, etc.
In a mild contamination scenario, UOA should indicate increased engine wear. The VO polymerizes LOOOONG before you can ever SEE it and the larger-sized molecules do not fit where the oil molecules are needed for adequate lubrication... I have read (won't mention the name, not generally considered a reputable source 
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