Okay so I had a vial of evo test e but it had little over 1ml left in it so i was doing a cleanup of my stash since i have like 8 empty vials just chilling thought i would get rid of all of them so i took the oil out of the evo vial and put it into one i got from pars...dumb me forgot people use different types of oil. When i put it into the vial it sank to the bottom and just stayed in a bubble so i gently swirled it and now its like mixed in and looks good but (can't find the right words used to describe what it looks like but it looks like oil and vinegar in the same bottle after its shake but not as bubbly more solvable if this makes any sense) I think it would be still good to use because why not but just never can be too sure. Heres a photo.
You can use it. The oils do not react with each other. It's like having oil and water in the same bottle almost, except with two different oils, one is just denser than the other. Pin one first then the other.