Anti-drain valve first springs to mind. But I don't know if the filter in question has one.quote:
Originally posted by BOBISTHEOILGUY:
ok filter guy, explain why a mobil 1 filter would keep oil in it after a month of being upside down and only 3k miles on it.
According to the EPA, you can dispose of any oil filter in a land fill if you hot oil drain it for 24 hours. If the filter has an anti-drain, then you poke holes in the dome end of the shell for the oil to drain.
This is also why lube centers use a filter crusher to crush the filters before the are picked up for disposal. Usually by a division of Waste Management Company.
Even after being crushed, transported to a smelter, you would be surprised at the amount of oil residue still left in the 55 gallon drum.
The oil does seep out from the saturated media after a used filter is stored over time. (due to gravity if I remember correctly)
And i'm going out on a limb here as i'm not a scientist or engineer but here goes..
but when you turn the filter upside down, the gasket would "seal" the filter to the surface. Air would not flow through the filter. The oil would seep out slowly and pool in the bottom of the filter. The inlet holes would allow traces out. When you pick the filter up, the gasket is no longer sealing the filter from the surface, air is allowed in, and the oil flows out causing the mess.
Or when you pick the filter up, the normal motion is to turn the filter 180 degrees so the inlet holes are now upwards, the oil starts to drain back to the bottom of the shell. You see the "leak" on the surface and turn the filter back over and now the rest of the oil comes flowing out.
Just a guess..