For about 30yrs now Ive been using a 'pre-treatment' that I mixed up. It lets me work a stock, get some oil in it, use it and do any fine tuning, etc. until Im ready to topcoat. Some of the projects have taken some years to finish and have never had a 'blending' problem after skinning off some wood here or there.
I like to heat the wood a bit to open the pores, dollop this on and hand rub in. Really saturate end grain to help seal.
Basically it started out with 50/50 oderless mineral spirits (turpentine would work too) with BLO. Over time Ive added some left over Tung Oil and LinSpeed Oil, some True Oil before it went gummy, etc. These just 'richened' the mix.
It really brings out the natural beauty of any wood and provides a perfect oil finish alone after repeated coats, or a perfect base under True Oil or even Poly.
After rubbing in I like to hang a stock by a cord outside in the sun and let it twist & dry. It seems that the sun rays really sets the stuff in a way that inside heat cant.