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From the referenced website:

This all happened because Delco switched to an "offshore" plant for the filters. They are taking the product from this new source that comes the closest to the PF35L specs and labeling it as a PF35L. Caveat emptor.

GM does NOT buy standard filters and put their label on it. When a filter is manufactured outside of GM it is to GM's design, not the filter manufacturer's off the shelf item.

Changes to a product often occur in development - the new designs are tested/validated before they are released to mass production.

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