Should i use oil-base or lates-base primer over existing oil-based paint if i'm planning to re-paint?

i have oil-base paint on my old wooden house (paint is still in good condition with no cracks or peeling)... since 80%-90% of the paint on the market is now latex paint, should i use oil-base or latex-base primer if i am planning to re-paint with latex-base paint?... in other words, oil-base primer is meant for oil-base paint, and latex-base primer is meant for latex paint... sooo, what will happen if i apply latex primer on existing oil-based paint, then apply a new coat of latex paint?... And, what will happen if i apply oil-base primer on the existing oil-base paint, then apply with new coat of latex paint? Last Question, what would be the recommended primer over existing oil-based paint, when i am planning to apply a new coat of latex paint? Thanks to anyone who can offer help.Should i use oil-base or lates-base primer over existing oil-based paint if i'm planning to re-paint?
Use the oil base primer it will adhere to the oil base paint presently on the house and allow proper adhesion for any type top coat paint to be applied over it.Latex primer is not recommended for priming over oil base paint and will not adhere properly. It will flake off over a short period of time. The rule of thumb is oil over oil, latex over latex, and always prime wood with oil base primer.Been in paint business for 34 years as painter and owner of business for 31 of those years,Should i use oil-base or lates-base primer over existing oil-based paint if i'm planning to re-paint?
The only primer I would use is B.I.N. shellac based.(clean your brushes with clear ammonia) or Glidden paint makes a product called Gripper. Gripper is tough stuff, I've never seen primer stick like that stuff does.