5w 30
Use Castrol GTX.
SAE 5W-30 is the preferred.
A/c delco.
It is written on the top of the oil filler cap. It should say 5W30 oil. Gastrol GTX is a real good oil to use. And you should always use a A/C delco oil filter.
10 W 40
Mobil 1 synthetic.
5W30 weight.
A/C delco
5W30. Synthetic or conventional is up to you.
10w30 should work fine. Go to a heavier oil to increase oil pressure.
80 or 85W90 GEAR OIL.