Citroen Sega can smell serious tail gas. What is the reason?

Oil smell (waste smell): the valve seat cushion is aging and leaking, the crankcase exhaust pipe is broken, the air conditioning filter element is dirty, and the throttle valve is dirty.

Gasoline smell: the carbon canister and solenoid valve are broken, and the top of the fuel tank leaks oil.

Waste odor: the exhaust pipe is rusted and perforated.

Coolant smell (leaking floor mat): the heating box is broken, or the sealing ring is aging and leaking.