It's pretty amazing the reach that First Brands had. This is the first time I've seen "out of stock" on a few different sites for popular blue AC Delco filters. Inventory on the remaining ones has been hit or miss.
Supposedly GM's new supplier(s) are ramping up production and popular filter "new supplier" filter models now have A/B/C designations depending on the product line and supplier? Like PF66A, PF66B, PF66C. A is their silver/advantage (budget, white filter/box) line, B is AC Delco Gold (black filter/box), and C is OE/Genuine GM (blue). Nothing like muddying the waters for the DIY mechanics.
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