Would putting Vallejo wash product after applying oils affect the oils?

AFIK it shouldn't, although I always do oil washes over acrylics

Agree, it should not affect. But as usual, start with a test in a hidden place, just in case...

Acrylics over oils don't effect oils but i am not so sure about the opposite,may the acrylic don't have enough grip on oils

The only time it's been a problem for me was when I tried using distilled turpentine as a medium for the oils--way too aggressive; soaked through the acrylic and lifted the primer. After switching to artist white spirits I've never had trouble. As someone said, test if you're not sure.

Yes.I used acrylic primer,second coat and oil wash mix with mineral spirits and all the acrylic paint came off.Did oil wash over road wheels,used to much and it ate the plastic.

I don't like acrylic primers; they just don't seem to hold up. I use automotive primer from a spray can. It means I have to wait for good weather and go outside to spray, but it gives me better results than I have gotten with any of my acrylic primers.