2016 buick lacrosse oil looks like cottage cheese

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driving home from work and the oil light came on and I immediately pulled over. The oil had just been changed two weeks and approx. 550 miles previous. I had the car towed to the dealer as it is under warranty and they are trying to say someone put to much oil in it. I know this is not true as I had it done at a family owned business and watched the entire process!