Yes.
Use any major brand 5W20 oil.
Exactly the weight that is listed in your owners manual and on the oil fill cap. Use any major brand of your choice.
5W30 oil.
no!
Yes, you can.
What engine is it in? 305/350 V8s use 5L of 5w30 in the winter and 10w30 in the summer
A 10W-30 or 10W-40 should be fine.
4 qts
5W30 weight.
MUST use 5W30 only.
A 5W-30 works in most climates.