only time you would need to replace valve covers,is if they are dented and allowing rockers to hit inside cover,or they have holes in em letting oil leak out. you may need to change valve cover gaskes as now and then they will leak oil
take the bolts out that hold them on and they will come right off.
Yes, a gasket goo is always advisable for valve covers.
Yes.
The valve cover gasket is damaged. Needs to be replace.
It is supposed to rattle when you shake it. if it does not, it needs replacing. The rattle you hear is the check valve.
Is your presta valve damaged and needs fixing or replacing?
Valve cover gasket needs replacing
Whether you do it through the valve covers or elsewhere, yes the engine needs positive crankcase ventilation.
It doesn't have a modulator valve.It doesn't have a modulator valve.
You Also Could Have Broken Piston Rings Causing Lots Of BlowBy. This Increases Pressure In The Oil Pan Causing This Problen Inside The Valve Pan. Also Try Replacing Your PCV Valve & See If This Helps. If Not You Engine Probable Needs A Rebuild Minute amounts of oil can seep from the valve cover gaskets and onto the exhaust manifolds and the resulting smoke will travel upwards past the valve covers making them appear to smoke
It is sometimes a problem but not necessarily due to the material the valve covers are constructed of. Check all the bolts holding the valve covers on an tighten them to exactly 5 lb/ft of torque and no more. If that does not stop the leak, then the valve cover gaskets will need replacing. If the oil leak is very slight, I would just leave it alone, as this can be an expensive repair unless you do it yourself.
Probably needs an overhaul.