However, generally speaking, 1999 Dodge Durangos likely used conventional or synthetic motor oil meeting the specifications of SAE 5W-30 or 10W-30. The specific viscosity grade (5W-30 vs. 10W-30) might be recommended based on climate and your owner's manual will specify this. The manual will also indicate the required API certification (like SM or SL, though these are older certifications now; newer standards are likely better).
Do not rely solely on this information. Always consult your owner's manual for the precise oil type and viscosity recommended by the manufacturer for your specific 1999 Dodge Durango engine. The oil type is crucial for the engine's longevity and performance.
