Sonic Drive-In

I have been craving pretzel twists for the past few weeks. We have been to this Sonic drive in 6 times and spend $ 10 to 25. I have noticed when I roll down my window in the drive thru that the oil smells old and like onion rings on most everything we order. Last night the onion rings were burned and the pretzel twists hard on the ends. I may or may not go back to this Sonic but I think they need to change their oil and not send out hardened pretzel twists. I was there around 7:17 check 141809. Drive thru 110.