That's what I tought. I recently purchased a WIX 51040 and find it very
similar to the Delco PF47. The guy at the store told me he cut open both
filters and they were exactly the same. I was curious because I remember
earing more than once that Delco were made by Champions labs. Last time I
purchased a Delco filter at the dealer I found it different from the Delco
at WallMart. The ones at WallMart were lighter and about half the price.
Either those were leftovers from a different manufacturer (Champions labs?)
or Delco are selling 2 different version of their PF47.
If I remember correctly, Motorcraft are either WIX or Purolator filters.
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