Oil on pistons?

Well here is

Well when it was running the smoke coming out of the breather was extremely toxic. Smealt like a lot of burnt fuel vapors to the point it was burning my eyes. So I still feel the fuel is the biggest issue at the moment. I also had a small oil leak that I had to fix and when I wiped it with my finger it smelt like a lot of fuel in the oil.
So sounds like you think it is gas you see on pistons and not oil?