Hi John.
Do you have any problems shutting the car
off?
If yes then this might be a clue as to why it
is so dirty.
The only reason that someone would put a
filter in the vacuum system is to filter out
oil that is present.
Do a search on the shut off valve and
the vac pump.
Plenty of info on why and where the oil is
entering the vac system.
Louis.
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