I just purchased a used RL SH AWD with 130K miles($6000) and have had no major issues so far. However a couple weeks ago I took the car to discount tire Co. and had four new tires put on and an alignment done. When I got the car back I noticed while I was I was on the freeway at 65+ that the car starts to sway slightly back and forth randomly.
This worries me because when I bought the car there were four different tires with three different sizes.(I bought the car in a rather sketchy situation, how I got it so cheap) anyway the car wasn't driven like this for long the random tires were just put on to sell the car. Also I didn't notice the swaying until after the new wheels and alignment were done but am not sure if it was there all along. Did these random tires Jack my ride or is this issue something else?