said by Subaru:For the longest time I've always wondered why Autozone never sold any Purolator stuff.. anyone know why?
For the same reasons a dealership family may not sell a certain car brand, or an HVAC company my not be a Carrier dealer, or a bicycle shop may not sell Trek, or.....
There are many reasons that a business doesn't sell certain brands. Maybe the owner feels another competitive brand is a better product, or they couldn't get the pricing they wanted for a product, or a product company does not agree with a business on some issues, maybe a product company has exclusive contracts with other businesses, etc. Or it could be that a business wants something different from what a competitive business is selling.
You probably will not get the exact answer you want without talking to the purchasing department for Auto Zone. And even then they would probably just give you some generic answer lacking any real details.