What kind of motor oil does a 1990 dodge dynasty use?

A 1990 Dodge Dynasty's recommended motor oil will depend on the engine it has. Dodge Dynasties of that year came with several different engine options (e.g., 2.5L, 3.0L, 3.3L V6).

You must check your owner's manual for the specific recommendation for your car's engine. The manual will specify the recommended viscosity (like 10W-30, 5W-30, etc.) and the type of oil (conventional, semi-synthetic, or synthetic).

Without knowing your engine size, any advice on oil type would be inaccurate and potentially harmful to your engine.