2005 PRI in West MI mileage now about 4600. Since I had a coupon I had an early oil change at 4200mi. After the oil change, the brakes have started to squeal anytime I put it in reverse. I can't conceive of any way an oil change could impact the brakes but am wondering if this is all just a coincidence. Can I try to ignore the squeal until the next oil change (Getting louder) or is this in need of immediate stop at the dealership.