Since the ratio should be linear, we will solve as follows:
We multiply the new ratio for gas (64 ounces) times the initial ratio of oil (1 ounce) and divide by the original ratio of gas (32 ounces), that is:
[tex]x=\frac{64\cdot1}{32}\Rightarrow x=2[/tex]So, we will have that we will need 2 ounces of oil.