Increasing the index of refraction and the translucence is closer to oil. Still not there yet. Could be the color is off - I'm trying to get the look of motor oil.

Vegetable oil is so translucent, that a thin layer of it has no color that I can see.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)