If oil is really blowing out to your air filter, it indicates a severe blow-by problem, most likely due to significant wear on the piston rings and cylinder bores. The only way to fix this is to rebuild or replace the engine.
Mass air flow sensor is mounted after the air filter.
The intake air temp sensor and the mass airflow sensor both mount near the air filter.
According to fordparts.com : For a 1995 Mercury Villager : Engine oil filter ( Motorcraft FL - 839 ) Engine air filter ( Motorcraft FA - 1121 ) Engine fuel filter ( Motorcraft FG - 978 )
There is no cabin air filter on a 1995 Villager.
There is no such part on a Mercury Villager.
It is under the black plastic trim plate under the windshield wipers.
In the tube between the air filter box and the rubber intake boot.
The starter is mounted at the top of the transaxle at the back of the engine. You can see it clearly if you remove the air filter box.
New spark plugs, spark plug wires, and a new air filter with higher air flow. Probably wouldn't hirt to change fuel filter too
In a 1998 Mercury Villager, the mass air flow sensor is located in the air intake tube. The air intake tube goes from the air box to the intake.
The Villager engine does not have a coolant bleed valve.
Under the dash.