It depends on the year and engine. 5w20. 5w30. 10w30, 15w40. Check your owners manual.
5w30 or 10w30
yesyes
10w30
5w20
5w30
10w30
5w30 or 10w30
5w30 or 10w30
7
It is not required. You can use conventional or synthetic oil.
A 1998 Ram 5.9L V8 uses 10W30.
5w30 or 10w30