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Oil you need is love
I use the M Grahm Walnut Oil to clean my brushes at the end of the day. They suggest using two containers containing their oil, one for an initial clean and wipe (repeat until all residue is gone) and the second for a final dip and wipe. I use brush cleaning canisters with an airtight lid and a screen halfway down. They say further treatment isn't nesessary if you're painting the next day but I always follow with Murphy's Oil Soap.
In my experience their walnut oil is more effective than using a vegetable oil from the supermarket or healthfood store. It seems thinner and cleans more easily. Also the paint sediment falls to the bottom of the canister more readily so the oil lasts longer and I can get more cleaning sessions out of it..
And best of all my studio is odor free and my brushes look like new.
I liked the M Graham Walnut Oil Alkyd Medium the best of all the Alkyd Mediums but it still destroyed my brushes. I find that linseed oil and thinner drys at almost the same speed.
The Gamsol is not odorless like some thinners it is LOW odor. The reason for this is because the evaporation rate is much slower than turpentine, therefore if you had an equal amount of both, the Gamsol would release far less fumes. Out of scent out of mind does not a safe studio make.
The fumes let you know if you're being exposed to toxins. Good health is the most important tool in the painter's arsenal.
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