The oil filter will hold max 1L. So let the car sit with the oil fill cap open, undo the oil filter and you should lose minimal oil.
No where near a liter, even when full. Opening the filler cap will do absolutely nothing. Its is not a sealed system. Look up PCV system.
Originally Posted by JDM DC2R
Not even a litter. But make sure you top up accordingly when done!
Yes, or at least check the level when done as a minimum.
Originally Posted by duzy
I will be installing an oil sandwich plate + sensors onto a b18c2.
I know I should drain the oil just to be safe, but would it be possible to just let the oil settle to the sump and remove the oil filter, install etc? And not lose a large amount of oil?
No need to drain the oil out of the sump if thats what your asking. The majority of oil will drain out of the filter back in to the engine when it is off. There will be some oil still in the filter when you unscrew it. Put a tray underneath, use rags, even screw the filter off with a plastic bag over it to catch the oil after you've loosened it.