Hi girls. I'm big on using the right gauge and length because it makes all the difference in the world. For thick oil bases, I use 20's and almost always use 1 1/2 for the glute. Us girls get big glutes from the squats and I KNOW it's deep intramuscular with the longer one. Now, for site injecting, like my delts & tri's, I use a 5/8. I use 22's for anything with crystals and move like the devil to get it in fast so as no crystals settling to cause me difficulty, that's the worst. But with Keno, I use the finest diabetic needle around and it goes in like a breeze. Hope this helps a little.