I don't know what did you mean by "oil"?
Are you talking about "stop leak" oil?
You need to give more info then people can give you better opinions.
First, based on your profile, yours SVX is 92? So do you know has it been converted to R134a freon yet? If it's not, you may need to convert it first, then you can put new freon in.
But again I think there's some freon which is compatible with both, so it's depended on what you get.