Around here they swap out OCD filters with Mobil 1 filters, and waste oil into fresh oil bottles quite often. I have been conditioned to check everything I buy that can be switched as a result. I got real good with checking filters, I can tell by simply lifting the box if a cheap filter was put into the Mobil 1 box. Then I give it a quick look to confirm, and I'm on my way, buying exactly what I'm paying for. I sucks to have to check, but this is seems to be a growing trend, at least around here.