NOTICE
Do not switch lubricant brands indiscriminately because some lubricants interact chemically when mixed. Use of inferior lubricants can damage the engine. (00184a)
Engine oil is a major factor in the performance and service life of the engine. Always use the proper grade of oil for the lowest temperature expected before the next scheduled oil change. Refer to Table 1. Your authorized dealer has the proper oil to suit your requirements.
If it is necessary to add oil and Harley-Davidson oil is not available, use an oil certified for diesel engines. Acceptable diesel engine oil designations include: CF-4, CG-4, CH-4 and CI-4.
The preferred viscosities for the diesel engine oils in descending order are: 20W50, 15W40 and 10W40.
At the first opportunity, see an authorized dealer to change back to 100 percent Harley-Davidson oil.
Table 1. Recommended Engine Oils
H-D TYPE
VISCOSITY
H-D RATING
LOWEST AMBIENT TEMPERATURE
COLD WEATHER STARTS BELOW 50° F (10° C)
H-D Multi-grade
SAE 10W40
HD 360
Below 4 °C (40 °F)
Excellent
H-D Multi-grade
SAE 20W50
HD 360
Above 4 °C (40 °F)
Good
H-D Regular Heavy
SAE 50
HD 360
Above 16 °C (60 °F)
Poor
H-D Extra Heavy
SAE 60
HD 360
Above 27 °C (80 °F)
Poor