I have oil in one of my cylinders on my Ford Focus Wagon Is it still safe to drive?

I have a ford focus wagon and one of the four cylinders has oil in it. I was told by my friend who is a mechanic that he changed the spark plugs for me for free. It runs great and I hear no car noises. Any temporary fixes if it needs to be fixed? What should I do!

Very tough to answer. More detailed info is required to accurately diagnose. Most often oil ruining spark plugs comes from valve cover gasket leaks and oil pooling up around the plug ruining the wires and sometimes leaking into the combustion chamber our fouling out the plug.

If your friend is saying there's oil in the actual combustion chamber you'd have to get into some pretty serious repair work just to find it. Possibilities include gaskets/rings/valve stem seals/oil leaking past spark plugs/etc you won't know until you further investigate. The cost of such repairs is ridiculous if not doing it yourself, most people would consider selling the vehicle ones internal problems like that start developing.

Stay away from any form of stop leak. Also if there's oil leaking into a combustion chamber it should be visible coming out of the exhaust. If your friend is describing oil leaking into the spark plug tubes (if you have a DOHC engine the plugs generally sit inside of tubes right through the center of the valve cover) then replace the gasket and the tube seals (sometimes you have to use silicone gasket material if actual seals aren't available) and you'll be fine.