.... First of all you are not blowing any contaminated oil or particulates back into the engine.
All that the filter catches in on the outside wrap of the filter media. The pierce of
the outer can on the filter does not compromise the media. The pierce tip is not that long.
Everything that the filter has captured is trapped in the filter when you remove it. The crud
cannot blow back past the anti drain reed valve in the filter, and inter the engine or it would
do this every time you shut it off. So This not possible and is of no concern. You are when
using this tool just evacuating the portion of the filter that would run out on the floor. When
you start your engine with a new filter, you are starting it with no oil in the filter. All that is
required to remedy that situation is to crank the engine about eight seconds and the filter is f
ull again! The restriction in the tool is only .085" and that is not anywhere near an adequate
air flow to blow everything in the cooler, filter, and oil passages back to the sump (perhaps
25% at most). The crank, bearings, cam, lifters and everything is still covered with oil,
and all is well.....