http://www.1stsubarudealer.com/all-subaru-cars/
Why change all four tires at the same time with AWD?
My current car (AWD Subaru) has new front tires and used rear tires. Why is this bad and what should be done about it? What if I do nothing?
Wow, nobody got this quite right.
The issue has to do with your AWD system and Subaru are more strict than most in their requirements. All four tires need to be not only the same size, but the same brand and model the total difference in wear between them should not be greater than 20%, or about 2/32″ tread depth.
Why? Because the minor differences in diameter between mismatched tires can cause the fluid that lubricates the viscous coupling in the transfer case to overheat, causing very expensive damage. I have witnessed this myself on several occaisions.
What happens if you do nothing? You may end up paying for a new transfer case.
Tires are cheaper.
Here is what is says on Subaru’s web site…
“For safe vehicle operation, SUBARU recommends replacing all four tires at the same time.
WARNING: All four tires must be the same in terms of manufacturer, brand (tread pattern), construction, degree of wear, speed symbol, load index and size. Mixing tires of different types, sizes or degrees of wear can result in damage to the vehicle’s power train. Use of different types or sizes of tires can also dangerously reduce controllability and braking performance and can lead to an accident.”
They also recommend that if you have to use the doughnut spare that you deactivate the AWD system since the spare is smaller than the other tires.
ASE Certified Automotive Service Manager working in the tire industry
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