When you’ve got a drum of oil it’s a good idea to stir it from time to time and I’ve found a method that works alarmingly well. However, you have to do this with the lid on the 55 gallon drum or you’ll be wearing your oil. The way to do this is to cut as small a diameter circle as possible to fit the mixer through so you can stir the oil without throwing it. I’ve only tried this with the bulk Evinrude XD 50 oil as that’s the drum I bought.
Once you’ve got the small hole cut in the top of the lid just place the immersion blender in the hole, you can even rest the motor of the blender on the lid if you cut your hole right. Plug it in, flip the safety and pull the triggers for unattended operation. Then just let it sit. These things are ultrapowerful and, ironically, are known as boat motors! It’s just a giant mixer that moves at an incredible speed. Don’t let it run too long so it doesn’t overheat, but long enough to stir all the oil in the drum. It may need a couple of minutes to really get moving.