Yes, you can but it's a bitch to get out all the air bubbles from the winny. It takes a while to get them to rise since they don't move well through the oil based EQ. I had to let mine sit over night and all the air bubbles rose up and then I was able to tap the case and get 90% of them out. I used another zambon amp and shot it separately from the EQ. The only advantage I see is doing one injection instead of 2 but that's all. Going forward, I'm going to do them separately.
I've been doing it for 6 weeks, no problem, I draw the prop, then the winny. then stick it in, don't worry about some air bubbles being in there, as it's an intramuscular shot it's not a big deal
you don't necessarily have to mix it. in fact you shouldn't because of the problem with air bubbles. however, putting it in the same syringe can make for greater convenience when using tren and prop.
draw up the winny first and keep the syringe tilted up so that the pin is facing up and the plunger facing down. keep it there and draw up the oil solution. you will now have 2 layers of liquid. just shoot it into your muscles as is. oil will not interfere with the release time of water based steroids unless the fats actually esterify onto the winny (it won't).
i did mis it in the same syringe, winny first like you said asnd it hurt like the fuck for the next couple days, both times, i think cause it takes more pressure to push the oil thropugh and less for the water and when you push the oil throuh your pushin hard and then it hits the water and it goes too fast