Can one replace just one new tire on an all wheel drive car or do you have to purchase 4 new tires?
“Like D?j? Vu, All Over Again!”
What is the car’s make, model and model year, please?
…and, we need to know both the odometer mileage of the car and the approximate number of miles that the tires have been used on that car.
While you are researching that information, I do want to point out that the authoritative opinion on this issue is likely printed in the Owner’s Manual. We like to help, but in the long run, the car mfr’s opinion is the only one that really matters.
Do a site search using “awd tire”. There are many discussions on this subject. For example: