Can you mix oil primer with latex primer?

No. It will alter the colour and properties of the paint - but you can buy premixed paint and primer at the store that is designed to work together.

Dont mix linseed oil and latex primer. Latex = Waterbased, Linseed Oil = Oil based Don't mix oil and water, unless you are making salad dressing.

water. Little bits at a time, stir, then add a little more until desired consistency.

yes. However, you cannot use an oil base paint over a latex primer. If you change your mind on the paint, you must strip the paint before you use an oil based paint on the primer.

Yes. oil will go over latex and/or acrylic with no problems whatsoever, it is usually inadvisable to paint latex or acrylic over oil (unless the oil is a primer). Primers are designed for the surface...