Have less than 7,000 miles driven on this car bought it used and tires replaced shortly before I purchased. just found a bubble on the sidewall of my front passenger side tire, not sure if it's manufactured defect or if something happened to it nothing really stands out in my mind that I hit but the roads are shit in Delaware. Either way, I know I need to get it replaced. what would the best suggestion be? change the tire immediately to the spare and ride on that until I can bring it to a shop to replace? also one shop I called said that they wouldn't put a different brand because it could affect the all-wheel drive, this is news for me as I thought that only tire size made a difference with the differentials. that being said, with the minimal amount of wear that's on my tires, would putting a new tire on just one wheel make any type of significant difference with how the all-wheel drive performs or affected durability? I would suspect no but does anyone see a problem with just replacing one tire or if there's a problem with one tire, should both front tires be replaced? Thank you