OK-- Last time this was posted, it was the general consensus (and I was a participant) that HK was Warren Oil (not WPP), then Citgo, and lately (with the change of bottles) Warren Oil again. Mid-States Distributing as listed as the distributor on the label, and I emailed through their portal asking sourcing but no response. However-- if I Google I get this on the api.org website: Company Name: Midco Distributing LLC Corporate Address: 1370 MENDOTA HEIGHTS RD MENDOTA HEIGHTS, MN, 55120-1281, United States License Status: Active License Number: 3428 Original License Issue Date: 24-Jan-2018 License Effective Date: 01-Apr-2020 License Expiration Date: 31-Mar-2021 Each of the Harvest King variants is listed on the web site. I was unable to get in through api.org without a password and didn't want to give you the huge address for the Google search but this comes up. The previous consensus that it was Citgo, then Warren Oil was based on bottle shape. The latest variation closely resembles the Warren Oil bottle. Here is the web site for Midco Lubricants. Appears to be a blender. http://midcolube.com/ The bottle has a Dexos License #D125AAAC334 that did not show up on the Dexos database (last time I checked on the previous post on this subject). So Midcolube???