I myself have never tried mixing an oil with winny's or any other water based juice in the same pin, but my uddy does it all the time. Is this safe for him or not. Every time he has done this it looks like there is air bubbles in the pin.
jams the needle, thats completely wrong, when using some course suspensions and winstrol's i've had to put some oil in there to help get it through the pin, ITS PERFECTLY FINE TO MIX THEM