Who makes STP oil filters, sold by Autozone?

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Seeing one STP made by Champ and one offshored, 'could be' newer stock versus older. The pics of WM stock boxes don't add any info to topic query. As noted, locally all STP OF tiers back to Champ Labs US made.
 
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Does champ labs operate any overseas manufacturing plants? My Chevy spark had oe delco filters that were made in Korea.
 
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