What type of oil do i use for a mitsubishi starwagon

pull our the dip stick and fill by that tube

try this forum http://www.mitsubishi-forums.com/70-l300-l400-delica-exceed-starwagon-forum/56290-l300-repair-manual-4x4.html

http://www.ebay.com.au/itm/Fuel-Filter-2000-For-MITSUBISHI-STARWAGON-WA-Petrol-4-2-4L-4G64-DL-/201234159710

check log book for the car

look in engine bay

Which area and country are you in?

Usually the rotor button can only be put back on in one direction. Look at the bottom of it there should be a small piece of metal there. Line that piece of metal up with the piece that looks like a a big pin inside.

Hi David, Some oil leakages occur only when the engine is running. As you've had the vehicle on a hoist lift and inspected underneath and discovered no major signs of leakage I suggest you start the engine and with the vehicle stationery, press the accelerator pedal so the engine is at about two thousand six hundred Revolutions per minute (RPM) With the engine running at that speed observe the exhaust. I believe you will then see bluish gray smoke being omitted. If I'm correct it will mean an engine rebuild as the smoke will indicate oil burn and defective piston rings. Indecently the usual cause is poor servicing and neglecting to replace the air filter. Regards John

The piston rings are worn out and there is no other solution but to replace it.
Do you see oil deposits in the EGR valve or rubber hoses?
If yes, than it's worn valves as well allows to 'blow' the oil into the system. Not familiar as how that model works but if you see no smoke, than it dumps the collected oil somewhere.
Check hoses for oil and underside of car.

Do you have an exploded view of the front wheel 4WD auto free mechanism? my car is mitsubishi delica starwagon 1991 model.