I'm having a problem where my fuel and oil are mixing in the intake and my dad says that it can cause my valves to go I was wondering if there's any solution without having to replace the entire heads

 

Can you be a little more specific? Supercharged engine or not? Where in the intake system do you think the mixing is taking place, in front of the throttle body or behind it?

And welcome to NAM.

 

I don't know exactly where, I'm new to actually working on cars and it's a 2005 Mini Cooper s, supercharged. We can see the oil and smell the gas on the inside of the inter cooler before the hoses to the throttle body

 

It is common to have oil inside the supercharger intercooler. Even lawnmowers recirculate crankcase oil vapors through the carburetor. If you do some searches in the Gen1 section, you will find discussions on the matter.

Some cars have allot of oil in the intercooler and some don't. My car is the second type.