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No you do not.
it spills
No!
if i dont close the bottle cap o the lava lamp it would produce more blobs than if i close it.
The cap should always be installed tight, that is the way the cooling system is designed to work.
No. It means the cap is not on tight enough. The coolant tank could also have a leak.
It is called a dome cap.
Neither your oil filter, or the fill cap need to be loose, the filter should be screwed on as tight as you can get it by hand only, and the fill cap should fit snugly so it does not come off. If the oil filter is loose or too tight you can blow out the seal which will cause you lose all your oil.
No - something is amiss. If the magazine cap (front of the forearm) is tightly screwed on then the barrel should be tight.
Hand tight
Gas Cap is not on tight, or the seal leaks and you need to replace the cap.
Yes - if the cap is not tight.