Letro wont suspend evenly in oil. the crystals are too big and at 2.5mg/ml the error is too large. think about it 1 crystal is the difference between a double dose. That is, unless you are super-savy and you get it into solution with a little alcohol first, maybe at a 1:3 ratio of alcohol to oil. Anyways you get it into solution in the alcohol then shoot some oil in the bottle containing the hot alcohol. The letro will crystalize into a fine suspension (looks like a snow globe and yes, ive tried this with water too - doesnt work well). Then when you shake it the alcohol and oil form a temporary emulsion which might actually be held with ps80 not sure.