Let's look at it this way. Heatbath/Parks won't sell you their oil. Houghton will sell you theirs, but 5 gallons of Houghto-Quench K will cost me about $180 including shipping. There have got to be more companies making quench oil than just two. I found a spec sheet for some Conoco branded oils claiming a 9 to 12 second quench speed, but haven't found any place that sells it. There's McMaster-Carr's 11 second oil that is readily available, but more of a medium/fast oil than a true fast oil like the K or #50. Do Mobil, Texaco, Exxon make a quench oil? Where do machine shops get oil for heat treating parts? You can't tell me every mom-and-pop machine shop buys oil by the 55 gallon drum. Any ideas?