Oils to use for my Mitsubishi Military Jeep?

[2Dmax]

guys, help naman po.

I had purchased a mitsubishi jeep 4dr6 turbo. I know that this jeep is one of most the toughest and reliable ride in the 2nd hand market. so in order to maintain it that way, preventive maintenance must be prioritized.

my problem is I don't know what kind of oil to used in my car since the car comes without the service manual. so help me guys what oil to use (rating and viscocity) to be used in the ff:

1. engine oil (4dr6 turbo) - ?
2. transmission oil - engine oil ba or SAE 90 or 140?
3. front and rear diffrential oil - API GL4 or GL5?
4. transfer case - ?

Thanks. Eto nga pala ang ride ko:

[2Dmax]

up ko lang po.. :P