As I understand it, Bosch Workshop filters and Bosch Premium filters are made by Purolator and are identical to Purolator Classic and Purolator One, respectively. Somebody please correct me if I'm wrong. This filter had 10,085 miles, 5 months, approx. 200 hours in service on my Ford 3.0L Vulcan. The order this filter came in shipped in 10/2018 and sat in a climate controlled room until it was used. Link to UOA here. I have been buying these filters for my shop in bulk in various sizes for a couple years. This is the first one I've cut open. At <$3.00 each, so far they are the best deal running for what we are doing. We are not a quickie lube place so savings on filters is not my #1 priority. 3422, this should be the same as a Purolator One (PL20195) for FL-400S applications. Filter media looks really good to me. No tears that I can see. Silicone ADBV. Maybe somebody knows what these characters mean. I don't. I have four or five used 3410 model filters on the shelf which I will cut open tomorrow, same as the FL-820S and PL24651 filters which were known for tearing. If all looks good with those I will be ordering another hundred this week.