Best engine coolant? - JeepForum Jul 20, 2010Best engine coolant? I would not install any OAT type coolant into a Jeep. I had read in several locations, not Prestone's website however that did not say, that their 5 year coolant was HOAT, so I'm not sure now if it is or not. I'm going to try to find out for sure.Author: JeeperawjWhat kind of antifreeze/coolant? - JeepForumJan 28, 2019HOAT Coolant for Jeep Grand Cherokee Laredo 2000 4.0 LOct 20, 2018Coolant recommendationJan 28, 2017coolant type - JeepForumJan 22, 2008See more results Jeep Wrangler OE Engine Coolant - Best OE Engine Coolant Order Jeep Wrangler OE Engine Coolant online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store.