Disco breathing heavily

There is a lot of smoke and pressure coming out of the oil filler cap.does anyone know what the problem is?Thank.

Traditionally that would be piston rings

It's customary to introduce yourself in the Introduce Yourself section before asking for advice. You won't get many replies otherwise.

However this is quite a common issue with causes ranging from very simple to very complicated. Have a search through the forum and if you still have questions then come back