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When changing a filter element
inside a housing drain all the oil from the housing first.
There should be a drain port near the bottom of the housing
as well as a port on the top to let the air in. This procedure
will eliminate debris that was trapped in the filter element
from rinsing out when pulld through the oil in a filled housing.
This debris will get a free run at your system when restarted
because it is already on the downstream side of the new filter
Source: Fleet Street Journal
Oil
Change Myths
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