I run both QW ether and QW alcohol oils in my DARTS. But my oil is "post process" filtered to remove particles....amber and clean is the result. I built a cart flusher from a hobby syringe (glue syringe) and 4" length of silicon tube. I insert the DART opening into the silicon tube. I then submerge the dart in warm ISO and by pushing and pulling the plunger back n forth, it power flushes out even crappy hard hash. I usually ISO flush for 2-3 minutes, then boil for 10 minutes. And DARTs work best when clean. If you clean your carts well, you can toss anything at then, for a long, long time. But to not use it for "runny" oil may be a mistake? Very thin oils like Pure Gold vape like a dream in the DART. After all it was originally designed on an AVA cart, used for thin liquid e-cig juice. I usually scoop up a dab on the dart tip or with Pure Gold, I use another hobby syringe as a loading dropper. Just press out a drop as needed. Don't fear the QWiso! It cleans up fine.