Hello, Henry. All of us who use oils struggled with the consistency of the paint at first.
I suggest blotting away as much of the oil that comes from the tube as possible -as Wolfgang suggests. I put a dab on an index card and let the oil seep out for about 1/2 an hour. Then transfer it to my palette.
Then fully mix the de-oiled color pigment with about 50% thinner (either odorless mineral spirits or Gamasol or other brand name). You want to achieve the consistency of skim milk. Since you are not undercoating with acrylics, then apply this thin mix directly over the primer. You may need several coats, depending on the color, but it will cover fully eventually when it dries and it dries flat. This also eliminates the build-up and gloss you get with oils that are too thick.
Be sure the primer you use is suitable and has "tooth" to grab and hold the oil paint. If the oil paint does not cover the primer easily, or if it beads up, then consider a different primer.
To dry the paint quickly, usually in about 8 hours, use a crock pot set on low temperature with the lid left ajar. Using a crock pot, you can paint the next day.
Good luck to you. Pj