However, generally speaking, 1999 Dodge Ram V8s (likely a 5.2L, 5.9L, or possibly a different engine) often used 10W-30 as a standard recommendation. In hotter climates, you might consider 20W-40. In colder climates, 5W-30 might be preferable.
Crucially: Check your owner's manual for the *specific* recommendation for your particular engine. The manual will detail the recommended viscosity grades for different temperatures. Using the incorrect weight can damage your engine.
