Franklin Chevrolet Cadillac Buick GMC

Had tires rotated and dealer left all lug nuts loose. I didn't find out until one nut came off and I noticed the car was not steering right. Check the wheels and lug nuts on all four wheels had not been ti didn't find out until one nut came off and I noticed the car was not steering right. Check the wheels and lug nuts on all four wheels had not been tighten. Had the oil changed and checked the oil a few days later and noticed it was down a quart. The car had never used oil before. I added oil to put the dip stick at the full mark and I have checked it several times since I added the oil and weeks and it is still on the full mark. More