Straight from their website.
"Our Council Bluffs manufacturing facility, Warren Performance Packaging, includes more than 255,000 square feet on 7 acres along the Missouri River, just north of Interstate 80. At that plant, Warren blends lubricating oils and chemicals for automotive applications and makes plastic bottles. Packaging operations include the manufacture of plastic bottles (from 8 fluid ounces to 2.5 gallon) and the filling of such with lubricants and chemicals, as well as packaging in 5-gallon pails, drums, totes, and bulk transport loading. Much of the product made at the plant is packaged for private label marketers but a significant portion is packaged under Warren's house brands including MAG 1 and Polar.