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I do generally "oil out" dry paint layers with a 50/50 mixture of linseed and mineral spirits nowadays, and wipe as much of it off as I can. Then I put on the new layer of paint.
I "oil out" mostly so the old colors come up to their original saturation. Then I can match the new colors to the old paint more accurately.
Then I paint on the new layer and blend one color into another with a fuzzy old sable brush, and then go over it with a synthetic fan blender, to get the soft edges. I put relatively thin layers of paint on the canvas (compared to what I used to, anyway!) because thick paint is much harder to blend.
Most parts of my paintings typically have one to four layers of paint on them by the time I'm done.
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