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April 17, 2026 Service bulletin

Exhaust smoke, oil carry-over or milky oil (M8 models with transmission-mounted breather)

Harley-Davidson technical service bulletin M1722 for 2024-2026 Harley-Davidson FLHX, 2024 Harley-Davidson Flhtk and 2024-2026 Harley-Davidson Fltrx and others.

Bulletin number
M1722
Component
Engine
Summary
SERVICE BULLETIN M1722 (REV A): EXHAUST SMOKE, OIL CARRY-OVER OR MILKY OIL (M8 MODELS WITH TRANSMISSION-MOUNTED BREATHER). PURPOSE: Revision A. Purpose for Service Bulletin. This bulletin informs dealers about: • The cause and effects of moisture in engine oil. • Service Manual troubleshooting updates for Milwaukee-Eight engines with the transmission-mounted breather, that have symptoms of moisture in oil and the best practices to avoid creating such instances. • New Job Time Code (JTC 3017 Diagnose Oil Carryover/Moisture) for service manual troubleshooting.

Owners of these vehicles have filed 17 complaints in the engine category.

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