ENGINE BREAK-IN RECOMMENDATIONSA long break-in period is not required for the engine and drivetrain (transmission andaxle) in your vehicle.Drive moderately during the first 300 miles (500 km). After the initial 60 miles(100 km), speeds up to 50 or 55 mph (80 or 90 km/h) are desirable.While cruising, brief full-throttle acceleration within the limits of local traffic lawscontributes to a good break-in. Wide-open throttle acceleration in low gear can bedetrimental and should be avoided.The engine oil installed in the engine at the factory is a high-quality energyconserving type lubricant. Oil changes should be consistent with anticipated climateconditions under which vehicle operations will occur. For the recommended viscosityand quality grades, refer to “Maintaining Your Vehicle.”NOTE:A new engine may consume some oil during its first few thousand miles (kilometers)of operation. This should be considered a normal part of the break-in and notinterpreted as an indication of an engine problem or malfunction.CAUTION!Never use Non-Detergent Oil or Straight Mineral Oil in the engine or damage mayresult.DIESEL ENGINE BREAK-IN RECOMMENDATIONS• For 3.0L diesel engine break-in recommendations, refer to Diesel Engine Break-InRecommendations on pg. 176• For 6.7L Cummins diesel engine break-in recommendations, refer to DieselEngine Break-In Recommendations on pg. 186O P E R A T I N G Y O U R V E H I C L E36
