This is an Asia exclusive product. It was available in the US last fall through the MAC Upstarts collection as a sample, but I don't see it on the MAC site so it probably isn't there anymore.
As you can see, the Cleanse Off Oil / Tranquil is packaged in a clear green bottle, different from the normal Cleanse Off Oil which comes in a clear bottle.
How to use
If you already know how to use cleansing oils these are no different. Basically, the cleansing oil is meant to be massaged onto your face dry, to dissolve your makeup. After that you should dampen your hands with water and massage your face again - the water and oil will emulsify and turn cloudy, while removing makeup at the same time. Finally rinse off with lukewarm water.
Thoughts on the performance
I can't seem to find the Tranquil oil on the MAC website, even the Asian sites, so I am not 100% sure if it is targeted at different skintypes than the regular oil.
In terms of makeup removal, the Tranquil is similar to the regular oil in that it removes most face makeup easily and quickly. It gets a bit hard to remove eyeliner that is closer to the lashline, since I don't like getting oil in my eyes but that is the same as all cleansing oils I've used.
After cleansing, both feel quite clean without any annoying residue on the face. However, I feel that the Tranquil version may be slightly gentler on my skin. I love both versions, but find the Tranquil feels like it leaves a bit more moisture in my skin compared with the regular oil.
They are both fairly odorless, but the Tranquil version has a slightly different smell - it seems to have a more bitter citrus smell than the regular oil. This is probably due to the slightly different essential oils in each product.
Tranquil Oil info & ingredients
The main oil components of the Tranquil oil appears to be sunflower and olive oil, while the regular oil is mainly olive and jojoba oil.
The regular Cleanse Off Oil ingredients list
Cetyl Ethylhexanoate, Olea Europaea (Olive) Fruit Oil, PEG-20 Glyceryl Triisostearate, Squalane, Simmondsia Chinensis (Jojoba) Seed Oil, Triticum Vulgare (Wheat) Germ Oil, Oryza Sativa (Rice) Germ Oil, Tocopherol, Chamomilla Recutita (Matricaria) Flower Oil, Citrus Aurantium Amara (Bitter Orange) Oil, Lavandula Angustifolia (Lavender) Oil, Oenothera Biennis (Evening Primrose) Oil, Water / Aqua / Eau, Rosa Canina (Rose) Fruit Oil, Limonene.
Both the regular Cleanse Off oil and Tranquil retail for approximately CA $30 per 150 mL, taking into account currency conversions.
Both oils are quite effective at makeup removal, and are priced in line with, or slightly cheaper than other popular cleansing oils such as DHC and Fancl. The Tranquil version is slightly harder to get, but may be worth a try if you find the regular Cleanse Off Oil to be a little drying.