Engine oil is a major factor in the performance and service life of the engine. Use the proper grade of oil for the lowest temperature expected before the next oil change. Your authorized dealer has the proper oil to suit your requirements. Refer to Table 1.

Motorcycles with a Twin Cam 110 engine are shipped from the factory with SCREAMIN' EAGLE SYN3 FULL SYNTHETIC MOTORCYCLE LUBRICANT 20W50. If SYN3 is not available and addition of motor oil is required, the first choice would be to add GENUINE HARLEY-DAVIDSON H-D 360 MOTORCYCLE OIL 20W50 to the SYN3 for engine lubrication. Although H-D 360 is compatible with SYN3, we suggest the mixture of the fluids be changed as soon as possible.

To switch lubricant to H-D 360, completely drain the SYN3 before filling with H-D 360. A residual amount of fluid will remain. It is not required to flush out the residual fluid.

If SYN3 or H-D 360 is not available, the third choice would be to add an acceptable diesel engine oil. We again suggest changing the mixture of the fluids as soon as possible. DO NOT add diesel engine oil to the primary chaincase or transmission.

Acceptable diesel engine oil designations include: SH, CH-4, CI-4 and CJ-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.