E N G I N E L U B R I C A T I O N
49
4-1
DET
AILED MAINTENANCE PR
OCEDURES
Proper engine lubrication is critical to the life and performance of your vehicle’s engine. American IronHorse
engines run best with 20W50-rated oil. For extremely low operating temperatures (below 40° F), 10W40 may be
used.
Change oil at recommended service intervals. In colder weather, dusty road conditions or more demanding
conditions, it is recommended that engine oil be changed more frequently.
Under normal operating conditions, slight water vapor in the crankcase is expelled through the breather port.
Operation in extremely cold ambient conditions or riding in short runs, however, may not allow the engine oil to
heat up to the point of passing water vapor thereby retaining it in the crankcase. Such occurrences may block oil
flow in the lines and create sludge in the crankcase.
WARNING: CHANGE THE OIL MORE FREQUENTLY THAN NORMAL SERVICE INTERVALS IN COLD WEATHER USE.
ENSURE THAT CRANKCASE OIL IS THOROUGHLY HEATED BEFORE DRAINING TO ENSURE COMPLETE REMOVAL
OF ALL ACCUMULATED WATER.
AmIronOwnerManual_body_06.qxp 5/22/2006 9:23 AM Page 49
