SEVERE USE DEFINITION
Pay special attention to the oil level. A rise in oil level during cold weather can indicate contaminants collecting in the oil sump or crankcase. Change oil immediately if the oil level begins to rise. Monitor the oil level, and if it continues to rise, discontinue use and determine the cause. Your dealer can assist.
MAINTENANCE CHART KEY
XU: Perform these procedures more often for vehicles subjected to severe use
D: Have an authorized dealer or other qualified person perform these services
E: Emission Control System Service (California)
Perform all services at whichever maintenance interval is reached first. Record maintenance and service in the Maintenance Log.
Source: MaintainX (Community Member)