well, I still use AC delco with no issues, although I was given a box of old ones (early 90's PF52's) and they do in fact look different than the new ones inside. the ones i have are white with blue delco lettering instead of the reversed new ones. either way, they still seem to clean my oil well and I have experienced no adverse effects
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2000 Chevrolet Malibu LS
2000 Oldsmobile Alero GL (sold)
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