Wait are you talking cooking oil or smokin oil? Sure you can make cannabutter with oil or any fatty substance for god's sake some just work better than others. I posted a thread on weed olive oil today I think, the G-13 church uses it so its gotta be good enough for me. Apperantly coconut oil digests better delivering the good stuff more potently than any other cooking oils.

Now as smokin oils go pick a solvent any solvent. No I'm just fuckin with ya but you can make hash oil witha ton of different solvents from Naptha to Everclear to Butane. Personaly I perfer the butane honey oil the best, nice and golden like the color of my piss is in the morning. Its a pretty fuckin pure product, I'd rate it right up there with some good "BubbleHash" maybe better. Plus you can make it with leaf you wouldnt even think about runnin through your bubble bags. I mean I harvested at least 1/4oz of knock you on your ass honey oil from shit I was gonna throw away. All you need is a piece of PVC pipe, two end caps, a drill, and a coffee filter, plus the leaf and your good to go. I find that when I'm making small amounts (less than 3grams) the butane has already evaporated before I'm done draining the pipe. All you gotta do then is get a razor blade and scrape it off whatever you used to collect it. I use a cassorole dish, nice and flat, makes it a lot easier to scrape up the goodies. It is very difficult to handle in its oil form so put it in the freezer for 15 minutes before you handle it to wiegh it or package it for sale or whatever, but its alot easier to touch the shit when its frozen. Dont get it on anything for it is difficult to remove from stuff and impossible to remove from clothing.