Overheated, exhaust leak, oil leak on manifold-hard to speculate
A manifold leak is usually in reference to a failure of the intake manifold gasket. It can leak air, oil or coolant. It can leak to the outside of the engine or internally into the engine. A manifold leak may also refer to the Exhaust manifold that is leaking exhaust fumes from a bad gasket or a crack in the manifold.
The answer is yes. A crack in a manifold is much worse than just the oil leak. Manifold cracks are generally caused by severe overheating or improper assembly of parts. A crack in a manifold can cause oil to leak but the oil leak is inconsequential as the crack renders the engine unusable safely, without replacing the manifold. Running an engine with a cracked manifold is very bad for the rest of the engine and your own safety.
The oil leak is coming from the valve cover gasket and leaking onto the exhaust manifold, the rubber valve cover gaskets get hard from the engine heat and start to leak, you will have to replace the rubber valve cover gaskets to stop the oil leak
Exhause leak? Bad Muffler? Leaking or cracked exhaust manifold? Bad EGR valve?
Yes
The leak can be from a cracked manifold, or from a bad gasket where it attaches directly to the engine. This leak is before the O2 sensor, so gives a false reading and may remain undetected. This is a serious issue! Exhaust leak from the manifold will allow the harmful CO2 emissions to enter the cabin. Exhaust leak will also cause decreased performance of your engine, and decreased fuel economy.
Yes, in fact you could.
V10 Left side exhaust manifold studs rusted away causing exhaust leak, 2002, 25,000 miles in motorhome.
If it is an internal leak the coolant will end up in the crank case mixed with your oil and it will ruin the bearing/engine - if external leak then the engine will overheat when it runs low on coolant, and blow your head gasket
It's hard to say with so little information. With something like the make, model and engine option of the vehicle, perhaps more can be known as regards the source of the leak.
In front of engine block on the drivers side just under egr pipe fron exh manifold. Check pcv hose that goes into intake manifold as it will collapse and leak. Check while running.