dude nurses always aspirate when giving IM injections. they are taught to always aspirate in nursing school and even if it's not enough liquid to kill someone, it will cause enough discomfort to warrant aspirating.
mtcn oil is also more viscous than standard carrier oils, it will be more difficult to push it through the artery in the case of a pulmonary embolism. carrier oils also do vary, from their thickness, to their decomposition times, there are significant differences between oils like ethyl oleate and grapeseed.
but if you want to pin without aspirating, your choice, i'm not trying to convince you otherwise. if you feel you'll live after injecting 3ml of oil into a vein, and probably you're right most of the time though i shudder at how bad you'd feel, and that's enough justification for you to never bother aspirating then knock yourself out man, i won't stop you. i've personally had a much smaller amount accidentally injected into a vein (ironically, i did aspirate when it happened too) and i can tell you i never want to experience that feeling again so i make sure to remember to aspirate every time.
it will take more than 1 or 2 ml of oil to kill a man, and when you inject into a vein, not all you inject will go into that vein. as the oil itself will act as a sort of plug. air is not a problem at all, you will need to inject 20 ml of air to kill a person....
i have been injecting myself with oils since i was in my early 20's, never ever got in trouble and i never ever aspirated....
sure i have had blood squirt out of my ass cheeck, my record is about a meter.... before it hit a wall.. lol!
all part of the game....
all the guys i know never ever aspirate, not the gym rat, not the top guys.... nobody.....
you want to get the hormone in, you want to get it in, but sometimes you are in a hurry... the wife is calling.... kids.... at work in the restroom , so you need to hurry as lunchbreak is almost over....no time to aspirate.... lol!!
