I love delts.
I've shot delts for 15years. just use a new 1.5" needle each time and scar tissue isn't too big of an issue.
gradually increase the oil volume or else you'll end up with stretch marks where the delt ties into the tricep.
I stopped the delts after i hit a big vessel and my wall looked like a murder scene. I had a hematoma the size of a grapefruit in the delt for weeks afterwards. Not good times. Hurt like a bitch too, training was a no go for upper body until it started to go away. And yes i did aspirate the syringe first. I went through the vessel and the blood shot out after i pulled the needle out. Had that crazy spasming in my delt and then spurts of blood like in the movies shot out.
For a while now i have been doing sub q in my abdomen for my shots. I love this! Z track so i dont get any bleeding and have plenty of areas to inject into since i am currently suffering SWOLIOSIS
Need to kick in a cutting cycle next month at some point.