Ive driven Dodges for over 20 years and been a tech for about as long. I've had 8 cylinders all the way down to 4 cyls. My favorite oil that has served me very well is Quaker State 10w30.
10w30
Next to the oil filter in front of engine, wire plug on top.
The 1990 Dodge Dynasty was offered in three engine trims between a 2.5 4-cylinder and 3.0 and 3.3L V6s. The vehicle can be run on API SJ or above 0 and 5W30 energy conserving oils year round. 10W30 is also fully compatible with these engines.
Any kind of name brand 10w-30 oil should work just fine.
most engines take 5w30 unless the oil cap says otherwise
4.54.5
Next to the oil filter.
5w30 or 10w30
4.5 quarts
5w30
With filter the capacity is 4.6 quarts.
About 4 quarts