This is too complicated to answer in this short of a space, but the oil trap is located under the intake manifold. This must be removed first and the the oil trap will be located on the side of the engine block facing the radiator.
The oil filter is there to trap any tiny particles that are in the oil. You change it because it becomes dirty over time. Change the oil at every oil change.
Oil separator
To replace the oil trap on your Volvo, please consult your owners manual. There should be a guide in there to help you with this repair.
Straight talk from the Oklahoma Oil Fields!Subsurface reservoir of shell oil and fuel (Petroleum trap) :Mixture of Water, Shell Oil or Crude and Natural Gas confined in porous rock like sandstone (Clastic). Natural Gas being the lightest occupies the top of the trap a layer of rock which prevents the upward escape of petroleum. Since Gas is lighter it moves upwards in the trap leaving a layer of oil and then water. Water has a greater density than oil leaving the oil layer to move up and water to move downwards in the trap.
Anticline formations can trap oil and gas creating deposits.
Not all Catch Cans are created equally. While a simple design may trap a few oil droplets, a well-engineered Catch Can is designed to condense the oil vapor and trap the oil inside the container.
: A discharge line trap has important functions both during the compressor on period and during its off period. During the on period, the trap acts as a turbulator to entrain oil droplets and carry them efficiently up the elevated discharge line. Therefore, traps would be most useful in unloading or multi-compressor systems to better ensure proper oil circulation during low system loads. Also, you are required to change the size of the pipe after the "P" trap.
there is a possibility that the wrong weight of oil is being used or the wrong type of oil filter. the filter might trap too much oil causing the upper portion to starve for oil.
because it may be sturctural trap of oil
Fold (anticline)
vegtable oil
Under the intake manifold.